For a customer, the time spent at a help desk with an associate is exponential with mean 120 minutes. If 5 customers are at the help desk being helped (independently) by five associates, find the probability that the waiting times of at least 2 of them are less that 120 minutes.

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The Answer of For a customer, the time spent at a help desk with an associate is exponential with mean 120 minutes. If 5 customers are at the help desk being helped (independently) by five associates, find the probability that the waiting times of at least 2 of them are less that 120 minutes.

For a Customer, the Time Spent at a Help Desk