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The manager of a bank recorded the amount of time each custome spent waiting in line during peak business hours one Monday. The frequency distribution

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The manager of a bank recorded the amount of time each custome spent waiting in line during peak business hours one Monday. The frequency distribution below summarises the results. Find the standard deviation. Round your answer to one decimal place. Waiting time Number of (minutes) customer 0 -3 10 4-7 16 8- 11 13 12 - 15 16- 19 NOW 20- 23

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