In a box there are 25 marbles, 15 of which are red, 13 made of clay (onlyIf U (V ) is the number of red (clay) marbles in our sample, find:

6 of these are red). We randomly select 8 marbles without replacement.

a) the expected value and standard deviation of 2U − 3V + 4

b) Pr(3U = V )