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7.The lengths of time that people are kept on hold when calling a computer company are normally distributed with a mean of 7.2 minutes. Find

7.The lengths of time that people are kept on hold when calling a computer company are normally distributed with a mean of 7.2 minutes. Find the standard deviation if 97.35% of callers are put on hold from between 3.0 minutes and 13.5 minutes.

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