suppose the random variable has pdf f(x) = x/12, 5 7 find e(x) three decimal

Answers

Answer 1

Expected value (E(x)) for the given probability density function is approximately 6.056.

How to find the expected value (E(x)) for the given probability density function (pdf)?

Here's a step-by-step explanation:

Step 1: Understand the expected value formula for continuous random variables:
E(x) = ∫[x × f(x)] dx, where the integral is taken over the given interval.

Step 2: Substitute the given pdf and interval into the expected value formula:
E(x) = ∫[x × (x/12)] dx from 5 to 7

Step 3: Simplify the integrand:
E(x) = ∫[(x²)/12] dx from 5 to 7

Step 4: Integrate the function with respect to x:
E(x) = [(x³)/36] evaluated from 5 to 7

Step 5: Apply the limits of integration and subtract:
E(x) = [(7³)/36] - [(5³)/36] = (343/36) - (125/36) = 218/36

Step 6: Convert the fraction to a decimal:
E(x) ≈ 6.056

So, the expected value (E(x)) for the given probability density function is approximately 6.056.

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Related Questions

help me pleaseeee thankss if u do

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The linear function defined in the table is given as follows:

y = 0.5x + 9.

How to define a linear function?

The slope-intercept representation of a linear function is given by the equation presented as follows:

y = mx + b

The coefficients of the function and their meaning are described as follows:

m is the slope of the function, representing the change in the output variable y when the input variable x is increased by one.b is the y-intercept of the function, which is the initial value of the function, i.e., the numeric value of the function when the input variable x assumes a value of 0. On a graph, it is the value of y when the graph of the function crosses the y-axis.

From the table, we get that the slope and the intercept are obtained as follows:

m = 0.5, as when x increases by 3, y increases by 1.5.b = 9, as when x = 0, y = 9.

Hence the function is:

y = 0.5x + 9.

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For f(x) = x to the power of 2 and g(x) = (x-5) to the power of 2, in which direction and by how many units should f(x) be shifted to obtain g(x)?

Answers

To obtain g(x) the graph of f(x) should be shifted in the right direction by 5 units

We can see and compare the graphs of f(x) and g(x) to see this visually

Since f(x) = x to the power of 2, so the graph of f(x) will be a parabola which will have center at the origin and opens upwards

The graph of g(x) will also be a parabola but it will have center at x = 5

So, we just need to shift the graph of f(x) by 5 units in right direction to obtain g(x)

In the equation of f(x), we just have to replace x with (x- 5) and we will get

g(x) = (x-5)^2

So, this will be the equation of parabola that's identical to f(x)

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We can start by setting the two functions equal to each other and solving for x:

f(x) = g(x)

x^2 = (x-5)^2

Expanding the right-hand side:

x^2 = x^2 - 10x + 25

Simplifying:

10x = 25

x = 2.5

So, the two functions intersect at x = 2.5. To shift f(x) to obtain g(x), we need to move it 5 units to the right, since the vertex of g(x) is at x = 5, which is 5 units to the right of the vertex of f(x) at x = 0.

Therefore, to obtain g(x) from f(x), we need to replace x with x-5:

g(x) = f(x-5) = (x-5) ^2

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The point x = 0 is a regular singular point of the given differential equation. xy" + 2y' - xy = 0 Show that the indicial roots r of the singularity differ by an integer. (List the indicial roots below as a comma-separated list.) | x Use the method of Frobenius to obtain at least one series solution about x = 0. Use (23) in Section 6.3 e-SP(x) dx y2(x) = y(x) of dx (23) where necessary and a CAS, if instructed, to find a second solution. Form the general solution on (0,0). O y=x[c, sinh x + C2 cosh hx] O y = [( sin x + C2 cos x] O y = [9 sinhx + C cosh x] O y=x[cz 5x] O y=x?[c, sinhx + ] sin x + C2 cos

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The given differential equation xy" + 2y' - xy = 0 has a regular singular point at x=0, and the indicial roots of the singularity differ by an integer.

To show that the indicial roots of the singularity differ by an integer, we need to use the Frobenius method to obtain a series solution about x=0. The differential equation can be written as:

x^2y" + 2xy' - x^2y = 0

Assuming a series solution of the form y(x) = ∑n=0∞ anxn+r, we can substitute this into the differential equation and simplify the terms to obtain a recurrence relation for the coefficients an:

n(n+r)an + (n+2)(r+1)an+1 = 0

To ensure that the series solution converges, we require that the coefficient an does not become zero for all values of n, except for a finite number of cases. This condition leads to the indicial equation:

r(r-1) + 2r = 0

which gives the two indicial roots:

r1 = 0, r2 = -2

Since the difference between the two roots is an integer (2), we have shown that the indicial roots of the singularity differ by an integer.

Using r1 = 0 as the dominant root, the series solution for y(x) can be written as:

y1(x) = c0 + c1x - (c1/4)x^2 + (c1/36)x^3 - (c1/576)x^4 + ...

Using the formula (23) in Section 6.3, we can find a second linearly independent solution y2(x) in terms of y1(x) as:

y2(x) = y1(x) ∫ (e^-∫P(x)dx / y1^2(x))dx

where P(x) = 2/x - x. After simplification, we get:

y2(x) = c2x^2 + c3x^3 + (2c1/9)x^4 + ...

Therefore, the general solution of the given differential equation on (0,0) can be written as:

y(x) = c1x - (c1/4)x^2 + (c1/36)x^3 - (c1/576)x^4 + c2x^2 + c3x^3 + (2c1/9)x^4 + ...

or, simplifying further:

y(x) = x[c1 + c2x + c3x^2] + c1x[1 - (1/4)x + (1/36)x^2 - (1/576)x^3] + ...

where c1, c2, and c3 are constants determined by the initial/boundary conditions.

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THIS IS -Using proportional relationships
Find the distance from the park to the house

Answers

similar triangles by AAA, thus

[tex]\cfrac{XT}{WY}=\cfrac{XZ}{ZY}\implies \cfrac{8}{4}=\cfrac{XZ}{5}\implies \cfrac{40}{4}=XZ\implies \stackrel{ meters }{10}=XZ[/tex]

Evaluate the integral. (use c for the constant of integration. remember to use absolute values where appropriate.) ∫ x^3 / x-1 dx
___

Answers

the final answer is:
[tex]\int \frac{ x^3} { x-1} dx = \frac{1}{3} x^3 + \frac{1}{2} x^2 + x + ln|x-1| + c[/tex] (where c is the constant of integration)

To evaluate the integral ∫ [tex]x^3 / x-1[/tex]dx, we can use long division or partial fraction decomposition to simplify the integrand.

Using long division, we get:

[tex]\frac{x^3}{ (x-1)} = x^2 + x + 1 + \frac{1}{ x-1}[/tex]
So, we can rewrite the integral as:

[tex]\int (x^2 + x + 1 + \frac{1}{(x-1)} dx[/tex]

Integrating each term separately, we get:

[tex]\int x^2 dx + \int x dx + \int dx + \int (1/(x-1)) dx\\= (1/3) x^3 + (1/2) x^2 + x + ln|x-1| + c[/tex]

Thus, the final answer is:

[tex]\int \frac{ x^3} { x-1} dx = \frac{1}{3} x^3 + \frac{1}{2} x^2 + x + ln|x-1| + c[/tex] (where c is the constant of integration)

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Write the expressions. Then evaluate.

1. a. the product of 5 and a number x.

b. Evaluate when x = -1.

2. a. 18 decreased by a number z

b. Evaluate when z = 23.

3. a.The quotient of 16 and a number m

b. Evaluate when m=4

4. aThe product of 8 and twice a number n

b. Evaluate when n = 3

5.aThe sum of 3 times a number k and 4

b. Evaluate k= -2

Answers

The values of the expressions are: 5x, -5, 18 - z , -5,  16/m, 4, 36n, 3k +4 , 2,

What is a mathematical expression?

Recall that a mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Mathematical symbols can designate numbers (constants), variables, operations, functions, brackets, punctuation and grouping to help determine order of operations and other aspects of logical syntax.

1a. the product of 5 and a number x.

= 5*x = 5x

b  Evaluate when x = -1.

= 5*-1 = -5

2a   18 decreased by a number z

this implies 18 - z

b Evaluate when z = 23.

18-23 = -5

3a The quotient of 16 and a number m

= 16/m

b  Evaluate when m=4

this means 16/4 = 4

4. aThe product of 8 and twice a number n

= 18*2(n)

= 36n

b. Evaluate when n = 3

= 36*3 = 108

5.aThe sum of 3 times a number k and 4

= 3(k) + 4

= 3k +4

b. Evaluate k= -2

= 3*-2 + 4

-6+4 = 2

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evaluate the given limit. (a) limx→0 sin 3x 4x

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Applying L'Hopital's rule, we get: limx→0 sin 3x / 4x = limx→0 3cos 3x / 4 = 3/4 Therefore, the limit of sin 3x / 4x as x approaches 0 is 3/4.



(a) lim(x→0) (sin(3x) / (4x))

To evaluate this limit, we can use L'Hôpital's Rule, which states that if the limit of the ratio of the derivatives of two functions exists, then the limit of the original functions also exists and is equal to the limit of the ratio of their derivatives.

Step 1: Take the derivative of the numerator and denominator with respect to x:
- Derivative of sin(3x) with respect to x: 3cos(3x)
- Derivative of 4x with respect to x: 4

Step 2: Rewrite the limit using the derivatives:
lim(x→0) (3cos(3x) / 4)

Step 3: Evaluate the limit by plugging in x = 0:
(3cos(3*0) / 4) = (3cos(0) / 4) = (3*1) / 4 = 3/4

So, the given limit is 3/4.

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How is a simple random sample obtained?A. By recruiting every other person who meets the inclusion criteria admitted on three consecutive days

B. By advertising for persons to participate in the study

C. By selecting names from a list of all members of a population in a way that allows only chance to determine who is selected

D. By selecting persons from an assumed population who meet the inclusion criteria

Answers

A simple random sample obtained by

selecting names from a list of all members of a population in a way that allows only chance to determine who is selected. So, option(C) is correct choice.

In probability sampling, the probability of each member of the population being selected as a sample is greater than zero. In order to reach this result, the samples were obtained randomly. In simple random sampling (SRS), each sampling unit in the population has an equal chance of being included in the sample. Therefore, all possible models are equally selective. To select a simple example, you must type all the units in the inspector. When using random sampling, each base of the population has an equal probability of being selected (simple random sampling). This sample is said to be representative because the characteristics of the sample drawn are representative of the main population in all respects. Following are steps for follow by random sampling :

Define populationconstruct a list Define a sample Contacting Members of a Sample

Hence, for random sampling option(c) is answer.

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1. In a group of people, 20 like milk, 30 like tea, 22 like coffee, 12 like coffee only, 6 like milk and coffee only, 2 like tea and coffee only and 8 like milk and tea only. Show these information in a Venn-diagram and find:
a)How many like at least one drink?
b) How many like exactly one drink?​

Answers

The following Venn diagram represents the supplied information:

        Milk

        /   \

       /     \

      /       \

  Coffee     Tea

    / \      /   \

   /   \    /     \

  /     \  /       \

M & C    C   T       M & T

 (6)    (12)    (2)   (8)

a) To find how many people like at least one drink, we need to add up the number of people in each region of the Venn-diagram:

Milk: 20

Tea: 30

Coffee: 22

Milk and Coffee only: 6

Coffee and Tea only: 2

Milk and Tea only: 8

Milk, Coffee, and Tea: 12

Adding these up, we get:

20 + 30 + 22 + 6 + 2 + 8 + 12 = 100

So 100 people like at least one drink.

b) To find how many people like exactly one drink, we need to add up the number of people in the regions that are not shared by any other drink:

Milk only: (20 - 6 - 8) = 6

Tea only: (30 - 2 - 8) = 20

Coffee only: (22 - 12 - 2) = 8

Adding these up, we get:

6 + 20 + 8 = 34

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each platform varies in the number of videos or images that can be added for a carousel ad, but the range is limited to what number?

Answers

The maximum limit to add the videos or images in Carousel is 10MB and the aspect ratio to add the images or videos is 1:1

There are many applications that are present where the videos and images can be added in the websites. The maximum images in the in few website is nine, but in carousel is 10MB of size and also it can be added up to 1:1 ratio of aspect size. The Carousel also allows the user to add slides and images. It helps to add the graphical representation.

The size of the videos must be from 60 seconds to 30 seconds of size and also the video includes the visual templets that help the user to have the presentation in an effective ways. There are many templets that also helps the  user to present in a professional way.  The carousel is a cloud representation that helps to create the slideshow online and also present it in the blockage videos. The online photos and images can also be added.

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find an equation of the tangent line to the curve y=8^x at the point (2,64) ( 2 , 64 ) .

Answers

The equation of the tangent line to the curve is y = 16ln(8)x + 32 - 64ln(8).

How to find the equation of the tangent line to the curve?

To find the equation of the tangent line to the curve [tex]y=8^x[/tex]at the point (2,64), we need to find the slope of the tangent line at that point.

The derivative of[tex]y=8^x[/tex] is [tex]y'=ln(8)8^x[/tex]. So at x=2,[tex]y'=ln(8)8^2=16ln(8)[/tex].

Therefore, the slope of the tangent line at (2,64) is 16ln(8).

Now we can use the point-slope form of a line to find the equation of the tangent line. The point-slope form is y-y1=m(x-x1), where (x1,y1) is the point on the line and m is the slope of the line.

Using the point (2,64) and the slope we just found, we get:

y-64 = 16ln(8)(x-2)

Simplifying, we get:

y = 16ln(8)x + 32 - 64ln(8)

So the equation of the tangent line to the curve [tex]y=8^x[/tex] at the point (2,64) is y = 16ln(8)x + 32 - 64ln(8).

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suppose there is a 38% chance that a mango tree bears Fruit in a given year. For a randomly selected sample of 8 different years, find the mean, Variance and standard deviatin for the number of years that the mango free does not bear fruit?

Answers

In a sample of 8 years, the mean number of years that the mango tree does not give fruit is 4.96, the variance is 1.87, and the standard deviation is 1.37.

The mean, variance, and standard deviation for the number of years that a mango tree does not bear fruit in a sample of 8 different years, given a 38% chance of bearing fruit in a given year, can be calculated using probability theory and statistical formulas.

To begin, we can find the probability of the mango tree not bearing fruit in a given year, which is 1 - 0.38 = 0.62. Using this probability, we can construct a binomial distribution with n = 8 trials and p = 0.62 probability of success (not bearing fruit). The mean (expected value) of the distribution is given by μ = np = 8 x 0.62 = 4.96.

The variance of the distribution is given by the formula σ^2 = np(1-p), which in this case equals 8 x 0.62 x 0.38 = 1.87. Finally, the standard deviation of the distribution is the square root of the variance, which equals sqrt(1.87) = 1.37.

Therefore, the mean number of years that the mango tree does not bear fruit in a sample of 8 years is 4.96, the variance is 1.87, and the standard deviation is 1.37. This means that we can expect the mango tree to bear fruit approximately 3 times in the sample of 8 years.

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Solve for x to make A||B. A 4x + 14 В 3x + 21 x = [ ? ]

Answers

Answer:

x = 7

Step-by-step explanation:

if A and B were parallel then

4x + 14 and 3x + 21 are alternate angles and are congruent , so

4x + 14 = 3x + 21 ( subtract 3x from both sides )

x + 14 = 21 ( subtract 14 from both sides )

x = 7

For A to be parallel to B then x = 7

suppose a 5 × 3 matrix has 3 pivot columns. is Col A = R^5 ? Is Nul A = R^2? Explain your results

Answers

A 5 × 3 matrix A has 3 pivot columns. Col A is a subspace of [tex]R^5[/tex] with dimension 3, and Nul A is not equal to [tex]R^2[/tex]; it has a dimension of 0.

Suppose a 5 × 3 matrix A has 3 pivot columns. A pivot column is a column in a matrix that has a leading 1 (pivot position) after performing row reduction. Having 3 pivot columns in matrix A means there are 3 linearly independent columns.
Now, let's consider the two parts of your question:
1. Is Col A = R^5?
Col A represents the column space of matrix A, which is the span of its linearly independent columns. Since A is a 5 × 3 matrix with 3 linearly independent columns, the dimension of Col A (the column space) is 3. Therefore, Col A is a subspace of [tex]R^5[/tex], but not equal to [tex]R^5[/tex].
2. Is Nul A = [tex]R^2[/tex]?
Nul A represents the null space of matrix A, which is the set of all solutions to the homogeneous system Ax = 0. The dimension of the null space called the nullity of A, is equal to the number of columns minus the number of pivot columns. In this case, nullity(A) = 3 (number of columns) - 3 (pivot columns) = 0. This means Nul A has a dimension of 0, not 2, and consists only of the zero vector. So, Nul A ≠ [tex]R^2[/tex].
To summarize, Col A is a subspace of [tex]R^5[/tex] with dimension 3, and Nul A is not equal to [tex]R^2[/tex]; it has a dimension of 0.

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use the table of integrals to evaluate the integral. ∫2 31x^3 √4x2 − x4 dx 0

Answers

The value of the integral is (11/15)√3.

First, we can simplify the integrand using the trigonometric substitution:

Let x = 2sinθ

Then dx = 2cosθ dθ and 4x^2 - x^4 = 4(2sinθ)^2 - (2sinθ)^4 = 4(4sin^2θ - sin^4θ) = 4sin^2θ(4 - sin^2θ)

Substituting these expressions into the integral, we have:

∫2^3 1x^3 √4x2 − x4 dx

= ∫sin⁡(θ=π/6)sin(θ=π/3) 8sin^3θ √(4sin^2θ)(4-sin^2θ) (2cosθ)dθ

= 16∫sin⁡(θ=π/6)sin(θ=π/3) sin^3θ cos^2θ dθ

We can use the identity sin^3θ = (1-cos^2θ)sinθ to simplify the integral further:

16∫sin⁡(θ=π/6)sin(θ=π/3) sinθ(1-cos^2θ)cos^2θ dθ

Now, we can make the substitution u = cosθ, du = -sinθ dθ, and use the table of integrals to evaluate the integral:

16 ∫u=-√3/2u=1/2 -u^2(1-u^2) du

= 16 [(-1/3)u^3 + (1/5)u^5]u=-√3/2u=1/2

= 16 [(-1/3)(-√3/2)^3 + (1/5)(-√3/2)^5 - (-1/3)(1/2)^3 + (1/5)(1/2)^5]

= 16 [(-√3/24) + (3√3/160) + (1/24) - (1/160)]

= 16 [(11√3/480)]

= (11/15)√3

Therefore, the value of the integral is (11/15)√3.

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How do I do this step by step

Answers

Step 1: Find the number of bronze members

40% of the gym's members are bronze members. Therefore, we need to find 40% of 4000. We can do this either by multiplying 4000 by 0.4 (40% as a decimal) or setting up a proportion. I will demonstrate the proportion method.

percent / 100 = part / whole

40 / 100 = x / 4000

---Cross multiply and solve algebraically.

100x = 160000

x = 1600 bronze members

Step 2: Find the number of silver members

Using the same methodology as last time, we can set up and solve a proportion to find the number of silver members.

percent / 100 = part / whole

25 / 100 = y / 4000

100y = 10000

y = 1000 silver members

Step 3: Find the number of gold members

Now that we know how many bronze and silver members the gym has, we can subtract those values from the total number of members to find the number of gold members.

4000 - bronze - silver = gold

4000 - 1600 - 1000 = gold

gold = 1400 members

Answer: 1400 gold members

ALTERNATIVE METHOD OF SOLVING

Alternatively, we could have used the given percents and only used one proportion. We know percents have to add up to 100. We are given 40% and 25%, which means the remaining percent is 35%. Therefore, 35% of the members are gold members. Just as we did for the silver and bronze members above, we can set up a proportion and solve algebraically.

percent / 100 = part / whole

35 / 100 = z / 4000

100z = 140000

z = 1400 gold members

Hope this helps!

For every household in a particular county, the water use in thousands of gallons over the course of a year was recorded. The mean water use for the households in the county was found to be 162 and the standard deviation was 140.a) based on the information given above, could the distribution of household water use for that county be approximately normal? Explain.b) A random sample of 50 households will be selected, and the mean water use will be calculated for the households in the sample. Is the sampling distribution of the sample mean for random samples of size 50 approximately normal? Explain.

Answers

The probability of x' bar to be greater than 59 is equal to 0.1193.

What is Mean value?

Apart from mode and median, mean is the one of the measures of central tendency. When we do the average of given set of values, it is called mean. Here in this question we need to check if the data meets the criterion for a normal distribution. One of these criterion is that data should be symmetric & bell shaped and another one is that mean and median should be approximately equal. By adding the total values given in the datasheet and dividing the sum by total no of values we will get the value of mean.

Here, the mean is = 162 point, the standard deviation = 140 point and x is considered as a variable for household water use in the country

μ=162

σ=140

X:- household water use for country

i.e., approx. Normal

(b) n=50

    n>30

i.e., approx. normal

(c) P(X'>59) = 1 - P(X'≤59)

                  = 1- P((X'-μ)/(σ/√n)≤59-57/(12/√50))

                  = 1- P(z ≤ 1.178)

                  = 1-0.8807

    P(X'>59)= 0.1193

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0.5 miles = 2,640 feet
O A. True
OB. False

Answers

Answer:

true

Step-by-step explanation:

Yes, the statement "0.5 miles = 2,640 feet" is true.
One mile is equal to 5,280 feet, so half a mile (0.5 miles) is equal to 2,640 feet.

Or

1 mile = 5280

1/2 = 0.5 / 5280 = 5280 / 2 =2640

find the terms through degree 4 of the maclaurin series. ()=2 (express numbers in exact form. use symbolic notation and fractions where needed.)

Answers

We need to calculate the first four derivatives of f(x) at x=0, and use the general formula for the Maclaurin series: f(x) = f(0) + f'(0)x + (f''(0)/2!)x² + (f'''(0)/3!)x³ + (f''''(0)/4!)x⁴ + ...

To find the Maclaurin series through degree 4 of a function f(x), we can use the formula:

f(x) = f(0) + f'(0)x + (f''(0)/2!)x^2 + (f'''(0)/3!)x^3 + (f''''(0)/4!)x^4 + ...

Here, we are given that f(x) = 2, which means that f'(x) = f''(x) = f'''(x) = f''''(x) = 0 for all values of x. Therefore, the Maclaurin series for f(x) through degree 4 is:

f(x) = 2 + 0x + (0/2!)x^2 + (0/3!)x^3 + (0/4!)x^4
    = 2

In other words, the Maclaurin series for f(x) is simply the constant function 2, since all of the higher-order derivatives of f(x) are zero.

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let xx and yy have joint density function
p(x,y)={23(x+2y)0for 0≤x≤1,0≤y≤1,otherwise.p(x,y)={23(x+2y)for 0≤x≤1,0≤y≤1,0otherwise.
Find the probability that
(a) x>1/7x>1/7:
probability =
(b) x<17+yx<17+y:
probability =

Answers

(a) The probability that x > 1/7 is 4/7

(b) The probability that x < 1 + 7y is 1/9.

How to find the probability that x > 1/7?

(a) To find the probability that x > 1/7, we need to integrate the joint density function over the region where x > 1/7 and y is between 0 and 1:

[tex]P(x > 1/7) = \int \int _{x > 1/7} p(x,y) dx dy[/tex]

[tex]= \int_{1/7}^1 \int _0^1 2/3 (x + 2y) dx dy (since p(x,y) = 2/3 (x + 2y)[/tex]for 0 ≤ x ≤ 1, 0 ≤ y ≤ 1, and 0 otherwise)

[tex]= (2/3) \int_{1/7}^1 (\int_0^1 x dx + 2 \int_0^1 y dx) dy[/tex]

[tex]= (2/3) \int_{1/7}^1 (1/2 + 2/2) dy[/tex]

[tex]= (2/3) \int _{1/7}^1 3/2 dy[/tex]

= (2/3) (1 - 1/14)

= 12/21

= 4/7

Therefore, the probability that x > 1/7 is 4/7.

How to find the probability that x < 1 + 7y?

(b) To find the probability that x < 1 + 7y, we need to integrate the joint density function over the region where x is between 0 and 1 + 7y and y is between 0 and 1:

[tex]P(x < 1 + 7y) = \int \int_{x < 1+7y} p(x,y) dx dy[/tex]

=[tex]\int_0^1 \int_0^{(x-1)/7} 2/3 (x + 2y) dy dx[/tex](since p(x,y) = 2/3 (x + 2y) for 0 ≤ x ≤ 1, 0 ≤ y ≤ 1, and 0 otherwise)

= [tex](2/3) \int_0^1 (\int_{7y+1}^1 x dy + 2 \int_0^y y dy) dx[/tex]

= [tex](2/3) \int_0^1 [(1/2 - 7/2y^2) - (7y/2 + 1/2)] dx[/tex]

= [tex](2/3) \int_0^1 (-6y^2/2 - 6y/2 + 1/2) dy[/tex]

=[tex](2/3) \int_0^1 (-3y^2 - 3y + 1/2) dy[/tex]

= (2/3) (-1/3 - 1/2 + 1/2)

= -2/9 + 1/3

= 1/9

Therefore, the probability that x < 1 + 7y is 1/9.

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chelsea wants to cover a rectangular prism-shaped box with paper. which is closest to the minimum amount of paper chelsea needs?

Answers

Chelsea needs at least 190 cm² of paper to cover the box.

To find the minimum amount of paper Chelsea needs to cover the rectangular prism-shaped box, we need to calculate the surface area of the box.

Surface Area = 2(lw + lh + wh)

Where,

L is length, W is width, aH nd f f is height.

So, to find the minimum amount of paper Chelsea needs, we need to know the box's surface area of the box. Once we have the dimensions, we can plug them into the formula and calculate the surface area.

For example, if the box has dimensions of length of 10 cm, width 5 cm, and height 30 cm, the surface area would be:

Surface Area = 2(50 + 30 + 15)

Surface Area = 2(95)

Surface Area = 190 cm²

Therefore, Chelsea needs at least 190 cm² of paper to cover the box.

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An equilateral triangle has length of each side 12 cm. Calculate the area of the triangle. Calculate its area.​

Answers

Answer:

72

Step-by-step explanation:

12x12 is 144

and 144/2 is 72

Answer:

72

Step-by-step explanation:

12 X 12 = 144

Then you divide the answer to 2 and you get 72

You're Welcome! :D

5.6t for t=0.7
(evaluate the expression)

Answers

Answer:

3.92

Step-by-step explanation:

To evaluate the expression 5.6t when t=0.7, we just substitute 0.7 for t and multiply:

5.6(0.7) = 3.92

Therefore, 5.6t when t is 0.7 equals 3.92. Good Luck!

A solid cone with a diameter of 10 centimeters and a height of 8 centimeters

Answers

The volume of a solid cone with a diameter of 10 centimeters and a height of 8 centimeters is equal to 209.47 cubic centimeters.

How to calculate the volume of a cone?

In Mathematics and Geometry, the volume of a cone can be determined by using this formula:

V = 1/3 × πr²h

Where:

V represent the volume of a cone.h represents the height.r represents the radius.

Note: Radius = diameter/2 = 10/2 = 5 cm.

By substituting the given parameters into the formula for the volume of a cone, we have the following;

Volume of cone, V = 1/3 × 3.142 × 5² × 8

Volume of cone, V = 1/3 × 3.142 × 25 × 8

Volume of cone, V = 209.47 cubic centimeters.

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Complete Question:

A solid cone with a diameter of 10 centimeters and a height of 8 centimeters. Find the the volume of this cone.

A pn junction with ND = 3 * 1016 cm3 and NA = 2 * 1015 cm3 experiences a reverse bias voltage of 1.6 V.
(a) Determine the junction capacitance per unit area.
(b) By what factor should NA be increased to double the junction capacitance?

Answers

(a) The junction capacitance per unit area is approximately 1.75 x 10^-5 F/cm². (b) To double the junction capacitance, we need to increase the acceptor concentration by a factor of 4. In other words, we need to increase NA from 2 x 10^15 cm⁻³ to 8 x 10^15 cm⁻³.

(a) The junction capacitance per unit area can be calculated using the following formula:

C = sqrt((qε/NA)(ND/(NA+ND))×V)

Where:

q is the elementary charge (1.6 x 10^-19 C)ε is the permittivity of the semiconductor material (assumed to be 12.4 ε0 for silicon)NA and ND are the acceptor and donor concentrations, respectivelyV is the applied voltage

Plugging in the values given in the question, we get:

C = sqrt((1.6 x 10^-19 C × 12.4 ε0 / (2 x 10^15 cm⁻³)) × (3 x 10^16 cm⁻³ / (2 x 10^15 cm⁻³ + 3 x 10^16 cm⁻³)) × 1.6 V)

C ≈ 1.75 x 10^-5 F/cm²

(b) To double the junction capacitance, we need to increase the acceptor concentration (NA) by a certain factor. We can use the following formula to calculate this factor:

F = (C2/C1)² × (NA1+ND)/(NA2+ND)

Where:

C1 is the initial capacitance per unit areaC2 is the desired capacitance per unit areaNA1 is the initial acceptor concentrationNA2 is the new acceptor concentration we need to calculateND is the donor concentration (assumed to be constant)

Plugging in the values from part (a) as C1 and NA1, and using C2 = 2C1, we get:

2C1 = sqrt((qε/NA1)(ND/(NA1+ND))×V) × 2

Squaring both sides and simplifying, we get:

NA2 = NA1 × 4

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What is the equation of the line, in standard form, that passes through (4, -3) and is parallel to the line whose equation is
4x+y-2=0?
04x-y=13
4x+y=13
4x+y=-13

Answers

Answer:

4x + y = 13

Step-by-step explanation:

The original equation is: 4x + y - 2 = 0 --> y = -4x + 2

Equation 1: 4x - y = 13 --> y = 4x - 13. Since it does not have the same slope as the original equation, Equation 1 is not the answer.

Equation 2 turns into y = -4x + 13. -3 = -4(4) + 13 = -16 + 13 = -3. Since the equation passes through this point and has the same slope as the original equation, it fits the criteria for the problem.

Hw 17.1 (NEED HELPPP PLS)

Triangle proportionality, theorem

Answers

Answer:

The Correct answer for x is 7

A 9-pound bag of sugar is being split into containers that hold 34 of a pound. How many containers of sugar will the 9-pound bag fill

Answers

Answer:36

Step-by-step explanation: 3/4, but take away the denominator. now we have 3. what's a multiple of 3 and 9? 36.

now divide 36 by the denominator, that's 9. so that's the answer. (i think)

To find the number of containers that can be filled with a 9-pound bag of sugar, we need to divide the total weight of the sugar by the weight of each container. Therefore, we have:
9 ÷ 34 = 0.26
Therefore, a 9-pound bag of sugar will fill approximately 0.26 or 1/4 of a container. Since you cannot have a fraction of a container, the answer is 0 containers of sugar.

David madd 4/3 of quart of fruit juice. Each mug he had holdes 1/3 of a quart. How many mugs will David be able to fill?​

Answers

4 mugs are required to fill if David made 4/3 of a quart of fruit juice. In each mug, he held 1/3 of a quart as per the fractions.

Fruit juice quart = 4/3

Holdes of quart =  1/3

This can be calculated by using the division of fractions. The number of mugs that can be filled will be calculated by using the fraction equation of division of quart of juice and holdes.

Mathematically,

number of mugs  = 4/3 ÷ 1/3

number of mugs  = 4/3 × 3/1

number of mugs = 4

Therefore we can conclude that David will able to fill in 4 mugs.

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Given any integer a and any natural number n, there exists a unique integer t in the set {0, 1, 2,...,n − 1} such that a ≡ t (mod n).
Can you type this question instead or writing?

Answers

I understand that you want an explanation for the given statement:

"Given any integer a and any natural number n, there exists a unique integer t in the set {0, 1, 2,...,n − 1} such that a ≡ t (mod n)."

Given any integer a and any natural number n, there exists a unique integer t in the set {0, 1, 2,...,n − 1} r: Given any integer a and any natural number n, there exists a unique integer t in the set {0, 1, 2,...,n − 1} such that a is congruent to t modulo n.

This statement is a fundamental concept in modular arithmetic, which means that when you divide a by n, the remainder is t. Since the remainder always lies between 0 and n-1 (inclusive), there is a unique integer t for every pair of integers a and n.

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