The following data, reproduced from Table 3.8 of Example 3-14, give the frequency distri- bution of the daily commuting times (in minutes) from home to work for all 25 employees of a company. Daily Commuting Time (minutes) 0 to less than 10 10 to less than 20 20 to less than 30 30 to less than 40 40 to less than 50 Calculate the variance and standard deviation. Number of Employees 9 6 4 2

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