continuous joint probability density functions - help!

das

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Jun 12, 2014
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Consider the following joint probability distribution function of (X , Y):

a(x + y^2) {0<=x<=2, 0<=y<=2}
0 otherwise

Calculate the value of the constant a that makes this a legitimate probability distribution. (Round your answer to four decimal places as appropriate.)

And then,
For the distribution above, determine the marginal probability density function of Y and use it to calculate the probability that 0.25 < Y < 0.75. (Round your answer to the fourth decimal place as appropriate.)
 
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