I need answer for 2,3,4

1 The discrete random variable B has 3 A handbag contains seven coins and three probability distribution function given by keys. Two items are taken out of the handbag P(B = b) = k(4 - b) for b = 0, 1, 2, 3. Find k one after the other and not replaced. Find and E(B). the expected number of keys taken out of the 2 Apply your probability distribution table handbag. from Exercise 71 question 4 to find the 4 A handbag contains five coins, four keys expected number of male births in a set of and eight mints. Two items are taken out triplets. Interpret your result. of the handbag one after the other and not replaced. Find the expected number of mints taken out of the handbag. 347