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Exercise 7.3.1. The amount of time needed to verify a credit card online using a popular security service has a mean of 8 seconds and

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Exercise 7.3.1. The amount of time needed to verify a credit card online using a popular security service has a mean of 8 seconds and variance of 9 seconds. Assume that the times required for different verifications are i.id. What is the variance in average service time when the number of customers served is (a) 107 (b) 100? (c) 1.000? (d) 10,000? (e) 100,000

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