5. (3 points) Suppose that only 0.1% of all computers of a certain type experience CPU failure during the warranty period. Consider a sample of 4.000 computers. a. (One point) What is the suitable approximation distribution for binomial distribution? Why? b. (One point) Based on point (a), compute P(4 S X S 6) (Use the formula of the pmi). c. (One point) Based on point (a), what are the expected and standard deviation values of the number of computers in the sample that have the defect