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Related Questions
1. The random variable X follows a distribution with the following probability density function
f(x) = 2x exp(-x²), x ≥ 0.
(a) Show that the cumulative distribution function for X is F(x) = 1 – exp(-x²).
(b) Calculate P(X ≤ 2). [4 marks] [1 mark]
(c) Explain how to use the inversion method to generate a random value of X. [7 marks]
(d) Write down the R commands of sampling one random value of X by using inversion method. Start with setting random seed to be 100. [6 marks]
Answers
a) The cumulative distribution function for X is F(x) = 1 – exp(-x²)
is = 1 – exp(-x²)
b) P(X ≤ 2) = 0.865
c) Generate a uniformly distributed random number u between 0 and 1.
a) We have given a probability density function f(x) = 2x exp(-x²), x ≥ 0
To find the cumulative distribution function (CDF), we integrate the probability density function (PDF) from negative infinity to x as follows;
∫f(x)dx = ∫2x exp(-x²)dx
Using u =
-x², du/dx = -2x
dx = -du/2∫2x exp(-x²)dx
= -∫exp(u)du
= -exp(u) + C
= -exp(-x²) + C
We know that, F(x) = ∫f(x)dx.
From the above calculation, the CDF of X is given by;
F(x) = 1 – exp(-x²)
b)
We are to calculate P(X ≤ 2)
We know that F(2) = 1 – exp(-2²)
= 0.865
Therefore, P(X ≤ 2) = 0.865
c)
The inversion method is a way of generating random values of a random variable X using the inverse of the cumulative distribution function of X, denoted as F⁻¹(u),
where u is a uniformly distributed random number between 0 and 1.
The steps for generating a random value of X using the inversion method are:
Generate a uniformly distributed random number u between 0 and 1.
Find the inverse of the cumulative distribution function, F⁻¹(u).
This gives us the value of X.
d)
R command for one random value of X by using the inversion method```{r}
# setting seed to be 100 sets. seed(100)
# defining the inverse CDFF_inv = function(u) q norm(u, lower.tail=FALSE)
# generating a random value of Uu = run if(1)
# calculating the corresponding value of Xx = F_inv(u)```
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Which statements about the figure are true? Select all that apply
Answers
:] i honestly have no clue my self
Randomly select a painted rock from a bag containing 4 purple rocks, 3 green rocks, 3 orange rocks, and 2 blue rocks.
Answers
Answer:
i got a orange
Step-by-step explanation:
find the change-of-coordinates matrix from the basisB = {1-7t^2, -6 + t+43t^2, 1+6t} to the standard basis. Then write t^2 as a linear combination of the polynomials in B.
Answers
To find the change-of-coordinates matrix from basis B to the standard basis, we need to express the standard basis vectors as linear combinations of the vectors in B. Then, to write t^2 as a linear combination of the polynomials in B, we can use the change-of-coordinates matrix to transform t^2 into the coordinates with respect to B.
To find the change-of-coordinates matrix from basis B to the standard basis, we express the standard basis vectors as linear combinations of the vectors in B. Let's denote the standard basis vectors as e1, e2, and e3. We can write:
e1 = 1(1 - 7t^2) + 0(-6 + t + 43t^2) + 0(1 + 6t)
e2 = 0(1 - 7t^2) + 1(-6 + t + 43t^2) + 0(1 + 6t)
e3 = 0(1 - 7t^2) + 0(-6 + t + 43t^2) + 1(1 + 6t)
The coefficients in these equations give us the entries of the change-of-coordinates matrix.
To write t^2 as a linear combination of the polynomials in B, we can use the change-of-coordinates matrix. Let [t^2]_B represent the coordinates of t^2 with respect to B. Then, [t^2]_B = C[t^2]_std, where C is the change-of-coordinates matrix. We can solve this equation to find [t^2]_B.
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Consider the functions F(x)= x^2+9x and g(x)=1/x.
F(g(-1))is ? , and G(f(1/2))is ? .
Answers
Answer:
a). -8 b). 4/19
Step-by-step explanation:
F(x)= x²+9x g(x)=1/x.
g(-1) = 1/ - 1
= -1
f(-1) = x²+9x
= -1² + 9(-1)
= 1 - 9
= -8
G(f(1/2))
f(1/2) = x²+9x
= 1/2² + 9(1/2)
= 1/4 + 9/2
= 19/4
g (19/4) = 1/x
= 1/19/4
= 4/19
Answer:
1). -8 2). 4/19
Step-by-step explanation:
F(x)= x²+9x g(x)=1/x.
g(-1) = 1/ - 1
= -1
f(-1) = x²+9x
= -1² + 9(-1)
= 1 - 9
= -8
G(f(1/2))
f(1/2) = x²+9x
= 1/2² + 9(1/2)
= 1/4 + 9/2
= 19/4
g (19/4) = 1/x
= 1/19/4
= 4/19
Solve for X triangle.
Answers
Answer:
x= 12.942
Law of sines :)
Solve for x. 1/2x - 1/4 = 1/2
Answers
Answer:
x = 3/2
Step-by-step explanation:
Simplify this equation by dividing all three terms by 1/4:
2x - 1 = 2, or
2x = 3
Then x = 3/2
. Since beginning his artistic career, Cameron has painted 6 paintings a year. He has sold all but two of his paintings. If Cameron has sold 70 paintings, how many years has he been painting?
Answers
Answer:
12
Step-by-step explanation:
Through 12 years he would have painted 72 paintings and since he hasn't sold two of them he has only sold 70.
Let p be a prime. Let K = F_p(t), let w = t^p - t and let F = F_p (w).
(a) Find a polynomial of degree p in F[x] for which t is a root. Use this to deduce an upper bound on [K: F].
(b) Show that the automorphism δ of K defined by δ (t) = t + 1 fixes F. Use this to factor the polynomial you wrote down in (a) into linear factors in K[x]
(c) Show that K is a Galois extension of F and determine the Galois group Gal(K/F).
Answers
The degree of the extension [K: F] ≤ p.
Suppose K = F_p(t) has transcendence degree n over F_p.
Then K is an algebraic extension of F_p(t^p).
(a) We need to find a polynomial of degree p in F[x] for which t is a root.
In F_p, we have t^p - t ≡ 0 (mod p).
So, we can write t^p ≡ t (mod p).
Since F_p[t] is a polynomial ring over F_p, we have t^p - t ∈ F_p[t] is an irreducible polynomial.
Hence the degree of the extension [K: F] ≤ p.
Suppose K = F_p(t) has transcendence degree n over F_p.
Then K is an algebraic extension of F_p(t^p).
The minimal polynomial of t over F_p(t^p) is x^p - t^p. Thus, [K: F_p(t^p)] ≤ p.
Since K/F_p is an algebraic extension, we have [K: F_p] = [K: F_p(t^p)][F_p(t^p): F_p].
Thus, [K: F_p] ≤ p².
Therefore, [K: F] ≤ p².
(b) We need to show that the automorphism δ of K defined by δ (t) = t + 1 fixes F.
Let f(x) be the polynomial obtained in part (a). Since f(t) = 0, we have f(t + 1) = 0. This implies δ (t) = t + 1 is a root of f(x) also.
Hence, f(x) is divisible by x - (t + 1). We can writef(x) = (x - (t + 1))g(x)for some g(x) ∈ K[x].
Since [K: F] ≤ p², we have deg(g) ≤ p.
Substituting x = t into the above equation yields 0 = f(t) = (t - (t + 1))g(t) = -g(t).
Therefore, f(x) = (x - (t + 1))g(x) = (x - t - 1)(a_{p-1}x^{p-1} + a_{p-2}x^{p-2} + ··· + a_1 x + a_0)where a_{p-1}, a_{p-2}, ..., a_1, a_0 ∈ F_p are uniquely determined.
(c) To show that K is a Galois extension of F and determine the Galois group Gal(K/F), we need to check that K is a splitting field over F.
That is, we need to show that every element of F_p(t^p) has a root in K.Since K = F_p(t)(t^p - t) = F_p(t)(w), it suffices to show that w has a root in K.
Note that w = t^p - t = t(t^{p-1} - 1).
Since t is a root of f(x) = x^p - x ∈ F_p[t], we have t^p - t = 0 in K. Thus, w = 0 in K.
Therefore, K is a splitting field over F_p(t^p).Since [K : F_p(t^p)] ≤ p, the extension K/F_p(t^p) is separable.
Therefore, the extension K/F_p is also separable. Hence, K/F_p is a Galois extension. The degree of the extension is [K: F_p] = p².
The Galois group is isomorphic to a subgroup of S_p. Since F_p is a finite field of p elements, it contains a subfield isomorphic to Z_p. This subfield is fixed by any automorphism of K that fixes F_p.
Since F_p(t^p) is generated by F_p and t^p, any automorphism of K that fixes F_p(t^p) is uniquely determined by its effect on t.
Since there are p choices for δ(t), the Galois group has order p. It follows that the Galois group is isomorphic to Z_p.
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A function, f(x),represents the height of a plant x months after being planted. Students measure and record the height on a
Select the appropriate domain for this situation.
OA.
the set of all real numbers
OB.
the set of all integers
O c.
the set of all positive integers
OD
the set of all positive real numbers
Answers
Answer:
I think the answer would be A or B, the best would be B.
Step-by-step explanation:
K so since it is monthly, it would not be all positive data. So you are left with A or B. Integers are numbers that are positive and negative so since the data can be a range of positive and negative numbers, that is why the data set of all integers (b) is the best choice.
Your welcome :D
wayfktgfydfug9ugi0b7ffiobv57f9pogasdfyuiohfdfhjkl
Answers
Answer:
Area of the circle = 572.3 square ft.
Step-by-step explanation:
Area of a circle is given by the formula,
Area of a circle = πr²
Here 'r' = Radius of the circle
Diameter of circle given in the picture = 27 ft
Radius of the circle = [tex]\frac{27}{2}[/tex]
= 13.5 ft
Area of the circle = π(13.5)²
= 3.14(13.5)²
= 572.265
≈ 572.3 square ft
Determine the area and circumference of a circle with radius 12 cm.
Answers
The area of the circle is 452.16 cm², and the circumference is 75.36 cm.
To determine the area and circumference of a circle with a radius of 12 cm, we can use the formulas:
Area = π * r²
Circumference = 2 * π * r
The radius (r) is 12 cm, we can substitute this value into the formulas to find the area and circumference.
Area = π * (12 cm)²
= π * 144 cm²
≈ 3.14 * 144 cm²
≈ 452.16 cm²
The area of the circle is approximately 452.16 square centimeters.
Circumference = 2 * π * 12 cm
= 2 * 3.14 * 12 cm
≈ 75.36 cm
The circumference of the circle is approximately 75.36 centimeters.
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solve the following cauchy problem. ( x 0 = x y, x(0) = 1 y 0 = x − y, y(0) = 0.
Answers
The solution to the Cauchy problem is x(t) = e^t and y(t) = te^t.
The Cauchy problem can be solved by finding the solution to the given system of differential equations.
In more detail, we have the following system of differential equations:
dx/dt = x - y
dy/dt = x + y
To solve this system, we can use the method of separation of variables. Starting with the first equation, we separate the variables:
dx/(x - y) = dt
Integrating both sides, we have:
ln|x - y| = t + C1
Exponentiating both sides, we get:
|x - y| = e^(t + C1)
Taking the absolute value, we have two cases:
(x - y) = e^(t + C1)
(x - y) = -e^(t + C1)
Simplifying, we obtain:
x - y = Ce^t, where C = e^(C1)
x - y = -Ce^t, where C = -e^(C1)
Next, we consider the second equation of the system. We differentiate both sides:
dy/dt = x + y
Substituting the expressions for x - y from the first equation, we have:
dy/dt = (Ce^t) + y
This is a linear first-order ordinary differential equation. We can solve it using an integrating factor. The integrating factor is e^t, so we multiply both sides by e^t:
e^t(dy/dt) - e^ty = Ce^t
We recognize the left side as the derivative of (ye^t) with respect to t:
d(ye^t)/dt = Ce^t
Integrating both sides, we have:
ye^t = Ce^t + C2
Simplifying, we obtain:
y = Ce^t + C2e^(-t), where C2 is the constant of integration
Using the initial conditions x(0) = 1 and y(0) = 0, we can find the values of the constants C and C2:
1 - 0 = C + C2
C = 1 - C2
Substituting this back into the equation for y, we have:
y = (1 - C2)e^t + C2e^(-t)
Therefore, the solution to the Cauchy problem is x(t) = e^t and y(t) = te^t.
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Factor completely x3 − 2x2 − 8x + 16.
(x + 2)(x2 + 8)
(x − 2)(x2 + 8)
(x + 2)(x2 − 8)
(x − 2)(x2 − 8)
Answers
The expression x^3 - 2x^2 - 8x + 16 can be factored as (x - 2)(x^2 - 8).
To factor the given expression x^3 - 2x^2 - 8x + 16, we can look for common factors or factor it using grouping. In this case, we can observe that the expression can be factored by grouping.
First, we can factor out a common factor of (x - 2) from the first two terms:
x^3 - 2x^2 - 8x + 16 = (x - 2)(x^2 - 8x - 8)
Now, we can further factor the quadratic expression (x^2 - 8x - 8) by factoring out a common factor of 8:
(x^2 - 8x - 8) = (x - 2)(x - 8)
Therefore, the complete factorization of the expression x^3 - 2x^2 - 8x + 16 is:
(x - 2)(x - 2)(x - 8) which can also be written as (x - 2)(x^2 - 8).
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1. In a zoo, there were 36 exhibits, but k exhibits were closed. Write the expression
for the number of exhibits that were open.
2. The zoo is open for 9 hours on weekdays. On weekends, the zoo is open for r more hours. Write the expression for the number of hours the zoo opens on weekends.
3. In the lion exhibit in the zoo, there are n lions. 3/5 of the lions are female. Write the expression for the number of female lions.
Answers
Answer:
Step-by-step explanation:
gh¯¯¯¯¯¯ has endpoints g(−3, 2) and h(3, −2). find the coordinates of the midpoint of gh¯¯¯¯¯¯ . a. (−3, 0) b. (0, 2) c. (0, 0) d. (0, −2)
Answers
The coordinates of the midpoint of the line segment GH with endpoints G(-3, 2) and H(3, -2) are (0, 0). The correct option is (C).
To determine the coordinates of the midpoint of the line segment GH with endpoints G(-3, 2) and H(3, -2), we can use the midpoint formula.
The midpoint formula states that the coordinates of the midpoint (M) are given by the average of the x-coordinates and the average of the y-coordinates of the endpoints.
Midpoint (M) = ((x1 + x2) / 2, (y1 + y2) / 2)
For GH, plugging in the coordinates, we have:
Midpoint (M) = ((-3 + 3) / 2, (2 + -2) / 2)
Midpoint (M) = (0, 0)
Therefore, the coordinates of the midpoint of GH are (0, 0), which corresponds to option c. (0, 0).
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find the length of the arc
Answers
Answer:
I am not sure rdbugs h h on grh g ih fv vy f byv7iplovh v v6c78
At 5 am, the temperature was -10°F. By noon the temperature was 7°F, What Integer
represents the change in temperature from 5 am, to noon?
Answers
Answer:
The integer that represents the change in temperature is 17.
Step-by-step explanation:
Write and solve an equation to find the missing dimension of the figure.
Answers
Answer:
15.5769230769
Step-by-step explanation:
8×13 = 104
1620÷104 = 15.5769230769
Find the area of the figure shown.
Answers
Answer:220
Step-by-step explanation:
LET X BE THE LENGTH OF RECTANGLE AND FOR UPPER PORTION OF DIA GRAM BASE OF RIGHT ANGLE TRIANGLE SO X=20
LET Y BE WIDTH OF RECTANGLE SO Y=8
LET P BE THE PERPENDICULAR OF THE RIGHT TRIANGLE SO P=6
THEN
AREA OF RECTANGLE=LENGTH*WIDTH
SO AREA OF RECTANGLE BECOMES=(20)(8)=160
AND AREA OF RIGHT ANGLE TRIANGLE BECOMES=1/2(BASE*(PERPENDICULAR)
SO =1/2(20)(6)=60
SO THE TOTAL AREA OF THE DIAGRAM=AREA OF RIGHT ANGLE TRIANGLE+AREA OF RECTANGLE=160+60=220
"Solve for x" also show how to do it so I can do it myself and actually learn.
Answers
Answer:
9√2
Step-by-step explanation:
To do this, we need to use the Pythagoras' Theorem. Which is a^2+b^2=c^2
In this case, we need to solve for C. So, we do 9^2 (A) +9^2 (B), assuming a and b are the same. So we end up with 81+81=c^2. Now, we find the square root of 162. Around 13 or 9√2
find the area of a triangle with a base of 8cm and a height of 10cm
Answers
Answer:
40 cm²
Step-by-step explanation:
A = 1/2bh
A = 1/2 (8) (10)
A = (4) (10)
A = 40
what equation represents this sentence? 28 is the quotient of a number and 4. responses 4=n28 4 equals n over 28 28=n4 28 equals n over 4 28=4n 28 equals 4 over n 4=28n 4 equals 28 over n
Answers
The equation that represents the sentence "28 is the quotient of a number and 4" is 28 = n/4.
In the given sentence, "28 is the quotient of a number and 4," we can break down the sentence into mathematical terms. The term "quotient" refers to the result of division, and "a number" can be represented by the variable "n." The divisor is 4.
1) Define the variable.
Let's assign the variable "n" to represent "a number."
2) Write the equation.
Since the sentence states that "28 is the quotient of a number and 4," we can write this as an equation: 28 = n/4.
The equation 28 = n/4 represents the fact that the number 28 is the result of dividing "a number" (n) by 4. The left side of the equation represents 28, and the right side represents "a number" divided by 4.
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HELPPPPP
Directions: Find the slope of the lines graphed below.
1.
2.
3.
4.
5.
6.
Directions: Find the slope between the given two points.
7.(-1,-11) and (-6, -7)
8. (-7.-13) and (1, -5)
9. (8.3) and (-5,3)
10. (15, 7) and (3,-2)
11. (-5, -1) and (-5, -10)
12. (-12, 16) and (-4,-2)
Directions: Use slope to determine if lines PQ and RS are parallel, perpendicular, or neither.
13.P(-9,-4), (-7, -1), R(-2,5), S(-6, -1)
m(PO)
m(RS)
Types of Lines
PLEASE HELLPPPP
Answers
Answer:
7. -4/5
8. 1
9. 0
10. 3/4
11. undefined/nonlinear
12. -9/4
13. parallel
Which graph shows exponential decay?
Answers
Answer:
the first one
Step-by-step explanation:
the first one
Using R Studio: generate a random sample of size 100 from the Slash distribution without extra packages
Answers
Use the rslash() function in R Studio to generate a random sample of size 100 from the Slash distribution.
To generate a random sample of size 100 from the Slash distribution without using extra packages in R Studio, you can use the inverse transform method. The Slash distribution is a continuous probability distribution with a density function given by f(x) = 1 / (π(1 + x^2)).
First, generate a random sample of size 100 from a uniform distribution on the interval [0, 1]. Then, transform the uniform random numbers using the inverse cumulative distribution function (CDF) of the Slash distribution, which is given by F^(-1)(x) = tan(π(x - 0.5)). This will map the uniform random numbers to the corresponding values from the Slash distribution.
In R Studio, you can use the following code to generate the random sample:
# Set seed for reproducibility
set.seed(42)
# Generate uniform random sample
uniform_sample <- runif(100)
# Transform uniform random sample to Slash distribution
slash_sample <- tan(pi * (uniform_sample - 0.5))
The slash_sample variable will contain the generated random sample of size 100 from the Slash distribution.
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सैम ने पहले हफ्ते में 27 किग्रा आटा खरीदा और दूसरे हफ्ते
में 3 किग्रा आटा खरीदा तो सैम ने कुल कितना आटा
Answers
Answer:
सैम ने 9 पाउंड आटा बनाया
Step-by-step explanation:
What additional measurement would support Amber's hypothesis?
O The measure of ∠C is 32°
O The measure of ∠C is 40°.
O The measure of ∠C is 50°.
O The measure of ∠C is 90°
Answers
Answer: B
Step-by-step explanation:
I know I’m late :(
100. 00 - 0.22 what is the answer show your work
Answers
Answer:
100.00-0.22 is 99.78
U have to use decimal method. don't use Normal method
The graph of a system of equations is
shown below.
a. (2,0) and (0,3)
b. (-40,-50)
c. the system has no solution
d. the system has infinitely many solutions
Answers
Answer:
The system has no solution.
Step-by-step explanation:
In order for the system to have a solution, both graphs must have an intercept to each others. We see in the picture that both graphs are parallel and do not have any interceptions which we don't know the solution to the system.
That means if graphs are parallel and have no interceptions, there are no solutions. The system of equations are for finding the interceptions of both graphs. But of course! Parallel lines do not intercept.
If you have any questions, feel free to ask.