Answer:


Step-by-step explanation:
We have two random variables X and Y.
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:


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

And multiplying the densities we got this:

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

And replacing we got:

Answer:
The answer is 21.
Step-by-step explanation:
6 * 2 = 12 + 9 = 21
−2(13x−15)
distribute by multiplication -2 to 13x and -15
-26x+30