Suppose that the joint probability density function of X and Y is fX,Y(x,y) = 10.125(x2 – y2) e−3x ,   for 00, takes the following form: fY|X=x(y) = C (x2-y2) xD e-Ex,   for -x

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.CR: Chapter 13 Review
Problem 29CR
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Suppose that the joint probability density function of X and Y is

fX,Y(x,y) = 10.125(x2 – y2) e−3x ,   for 0<x<∞ and -x<y<x

                   0,                         otherwise           

Give your answers to the below questions in two decimal places where appropriate.

(a) The marginal probability density function of X is given by:

fX(x) = A xB e-3x ,   for 0<x<∞

             0,                otherwise

Find the value of A.

(b) Find the value of B.

(c)

The conditional probability density function of Y, given that X=x for some x>0, takes the following form:

fY|X=x(y) = C (x2-y2) xD e-Ex,   for -x<y<x

                   0,                               otherwise.

 

Find the value of C

(d)Find the value of D.

(e)Find the value of E.

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