Answer to Question #65547 in Electrical Engineering for lilonas

Question

A bowl contains 10 Red balls and B blue balls. 5 balls are selected at random (without replacement). Let X be the number of blue balls selected. Find the average value of X. Find the Variance of X. Now assume you select 5 balls with replacement (i.e. you pick up a ball, note its color, and then put it back again). Find E(X) and VAR (X) for this case.