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Suppose we are told that the mean time spent by assistants at morning tea is 20 minutes with a standard deviation of 5 minutes. A

Suppose we are told that the mean time spent by assistants at morning tea is 20 minutes with a standard deviation of 5 minutes. A random sample of 25 managers was asked how long their assistants spent at morning tea. What is the probability that the average for their assistants was less than 22 minutes?

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