Problem: 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.
1) Find and interpret the variance and standard deviation of these sample values.
2) Are the empirical rules applicable for these data? If not, explain why.
Attachment:- variance and standard deviation.rar