Can be considered to follow exponential distribution

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The call center serves callers with a Poisson distribution at the rate of 9 per hour. Service takes an average of 6 minutes and the service times can be considered to follow an exponential distribution.

What is the (a) minimum number of servers required so that at least 70% of the callers can receive service immediately?

(b) minimum number of severs required so that the average time a caller waits for service is no more than 30 minutes as advertised? No more than 15 minutes?

Reference no: EM131127651

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