Let X = amount of time (in minutes) an  Agent spends with a customer. The time is known from historical data to have an average equal to four minutes. 4 Find λ Find σ Required: μx 4 Find λ   Find σ   a) Find the probability that the agent spends at most 5 minutes assisting a customer. b) Find the probability that the agent spends 4 minutes or less assisting a customer. c) Find the probability that the agent spends 4 to 5 minutes assisting a customer.

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