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A system serves customers in the queue one by one. Suppose that the service time A_b...

A system serves customers in the queue one by one. Suppose that the service time A_b for customer b has a mean of 2 min(minutes) and variance of 4. suppose that service time for different customers is independently and identically distributed.
(1)Let Abar denote the average waiting time of the next 25 customers. Prob(1.8 min < Abar < 2.2 min) =
(2)Find the time t making Prob(aBar > t ) = 0.9.
Math   Statistics-And-Probability   
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