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Standard Deviation of Customer Service Times at Drive-Up Window

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In effort to provide more consistent customer service, a manager of a local fast food restaurant would like to know the dispersion of customer service times about their average value for the facility's drive-up window. The attached file contains 200 customer service times, all of which were observed during the busiest hour of the day for this fast-food operation.

a)find and interpret the variance and standard deviation of these sample values.
b)Are the empirical rules applicable for these data? If not, explain why.

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