Finding standard deviation of waiting time

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Reference no: EM1327029

The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency distribution below summarizes the results. Find the standard deviation.

Waiting time (minutes) Number of customers

0-3 13
4-7 16
8-11 8
12-15 11
16-19 0
20-23 2

Reference no: EM1327029

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