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3 years ago

Give the value of x in these equivalent ratiox:77 -7:11

Mathematics

1 answer:

aleksandr82 [10.1K]3 years ago

6 0

Step-by-step explanation:

$x: 77 = 7 : 11 \\x = \frac{77 \times 7}{11} = \\ = 49$

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Let X have the uniform distribution U(0, 2) and let the conditional distribution of Y , given that X = x, be U(0, x). Find the j

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Answer:

$f(x,y) = \frac{1}{x} \frac{1}{2}= \frac{1}{2x} , 0\leq x \leq 2 , 0\leq y \leq x$

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Step-by-step explanation:

We have two random variables X and Y. $X \sim Unif(0,2)$ and given that X=x, Y has uniform distribution (0,x)

From the definition of the uniform distribution we have the densities for each random variable given by:

$f_X (x) =\frac{1}{2} , 0\leq x\leq 2$

$f_{Y|X} (y|x) = \frac{1}{x}, 0\leq y \leq x$

And on this case we can find the joint density with the following formula:

$f(x,y) = f_{Y|X}(y|x) f_X (x)$

And multiplying the densities we got this:

$f(x,y) = \frac{1}{x} \frac{1}{2}= \frac{1}{2x} , 0\leq x \leq 2 , 0\leq y \leq x$

Now with the joint density we can find the expected value E(Y|x) with the following formula:

$E(Y|x) = \int y f_{Y|X}(y|x)dx$

And replacing we got:

$E(Y|x) = \int_{x=y}^2 y \frac{1}{x} dx= y ln x \Big|_{x=y}^2 =y ln 2 -y ln y = y(1-lny) \$

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4 years ago

The circumference of a circle can be found by multiplying Pi by the diameter. True False

Softa [21]

Here's a formula to find the circumference of a circle
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Multiplication has commutative property, we can change the order of operands without changing the result. I move 2 to the right.
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Remember d = 2 × r
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The answer is true. The circumference of a circle can be found by multiplying pi by the diameter

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3 years ago

Given m||n, find the value of x. т (6x-20) mm (6x-4)

Zanzabum

Answer:

The answer is 2. The Value of x is 2.

Step-by-step explanation:

Mark me BRAINLIEST!!!

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2 years ago

Give the value of x in these equivalent ratiox:77 -7:11​

Give the value of x in these equivalent ratiox:77 -7:11