Question: A manager of a computer help desk operation has collected enough data to conclude that the distribution of time per call is normally distributed with

A manager of a computer help desk operation has collected enough data to conclude that the distribution of time per call is normally distributed with a mean equal to 8.21 minutes and a standard deviation of 2.14 minutes. What is the probability that three random monitored calls will each be completed in 4 minutes or less.

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