Question 3 The lifetimes of interactive computer chips produced by a certain semiconductor manufacturer are normally distributed having mean 4.4 X It}Er hours with a standard deviation of 3 x 135 hours. a) If a mainframe manufacturer requires that at least 9'0 percent of the chips om a large batch will have lifetimes of at least 4.12] X Hill5 hours. should he contract with the semiconductor rm?I b) What is the probability that a batch of 1m} chips will contain at least 4 whose lifetimes are less than 3.8 X1135 hours