Problem on exponential distribution

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Between the hours of one and three in the afternoon, customers arrive at the Central National Bank Office at an average rate of 2 per minute, Poisson distributed. It will take a teller an average of 45 seconds to process a single customer, following Exponential distribution. How many tellers are required to have an average time in line (before service) of no more than 30 seconds per customer?

Reference no: EM13215533

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