At what average rate must a clerk in a supermarket work in order to ensure a probability of 0.90 that the customer will not wait longer than 12 minutes? It is assumed that there is only one counter at which customers arrive in a poisson fashion at an average rate of 15 per hour and that the length of the service by the clerk has an exponential distribution
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solve the problems use & assume customer population ... Probability that an arrival will not have to wait in the queue for service = Po ... The mean arrival rate = λ = 1/8 x 60 = 7.5 / hour .
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