given the jointly PDF function as: fy(xy)=0.05 [u(x)-u(x-5)] [u(y)-u(y-4)], the value of the E[Y] is a. none of these b. 5. с. d. 0. Two random variables X and Y have a joint probability density...

Extracted text: given the jointly PDF function as: fy(xy)=0.05 [u(x)-u(x-5)] [u(y)-u(y-4)], the value of the E[Y] is a. none of these b. 5. с. d. 0. Two random variables X and Y have a joint probability density function given by fXY(x, y) = Kxy, 0 < 2,0="">< y="">< 2,="" and="" 0="" otherwise,="" then="" the="" value="" of="" k="" is="" а.="" 1/2="" b.="" 1="" c.="" 1/4="" d.="" 1/3="" the="" joint="" nth="" order="" central="" moment="" of="" x="" and="" y="" random="" variables="" are="" a.="" the="" mean="" of="" x="" if="" n="k" =="" 1="" b.the="" variance="" of="" x="" if="" n="2," and="" k="0" c.="" zero="" if="" n="k" =="" 0="" d.the="" central="" mean="" of="" x="" if="" n="k" =="" 1="">