1) Let X and Y be two continuous random variables defined over the unit square. What doescequal if f x,y(x,y) =c(x^2 + y^2)?

2) Suppose that X and Y have a bivariate uniform density over the unit square:

f x,y(x,y) =cwhen 0 < x < 1, 0 < y < 1 and

0, everywhere else

a) Findc

b) Find P (0 < X < 1/2, 0 < Y < 1/4)

3) A point is chosen at random from the interior of a circle whose equation is x^2 + y^2 less than or equal to 4. Let the random variables X and Y denote the x and y coordinates of the sampled point. Find f x,y(x,y).

4) For the following pdf, find fx(x) and fy(y)

f X,Y(x,y) = 1/x, 0 < y < x < 1. (All these inequalities or less than or equal to, I just don't know how to do that on here.)