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The times that customers spend in a book store are normally distributed with a mean of 39.5 minutes and a standard deviation of 15.9 minutes.

The times that customers spend in a book store are normally distributed with a mean of 39.5 minutes and a standard deviation of 15.9 minutes. A random sample of 30 customers has a mean of 36.1 minutes. Would this outcome be considered unusual, so that the store should reconsider its displays?

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