Calculate Mean, Median, and Standard Deviation

Complaints have reached the City Manager of Normal that it is taking too long to pay bills submitted to the City. You are assigned to check how long it takes by looking at a few bills. Following are the lengths of time in days that it has taken the City to pay seven bills. Calculate the mean, median, and standard deviation. Would you report the mean or the median? Why? 34, 27, 64, 31, 30, 26, 35.

A complete, neat and step-by-step solution is provided in the attached Excel file with regards to calculating mean, median and standard deviation.