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Question 8 The manager of a bank recorded the amount of time each customer spent waiting in line du peak business hours one Monday. The

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Question 8 The manager of a bank recorded the amount of time each customer spent waiting in line du peak business hours one Monday. The frequency distribution below summarizes the results Find the standard deviation of the frequency distribution. Round your answer to one more decimal place than is present in the original data values. Waiting Time (minutes) / Number of Customers 0-3 4-7 CONN 8-11 12-15 11 16-19 20-23 Question 9 8 The mean of a set of data is 105.27 and its standard deviation is 8.68. Find the z score for a value of 140.28

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