The following frequency table summarizes the distances in

Question

The following frequency table summarizes the distances in miles of 101 patients from a regional hospital.

Distance          Frequency     

0-2                   43

2-4                   28

4-6                   20

6-8                   7

8-10                 3

Calculate the sample variance and standard deviation for this data (since it is a case of grouped data- use group or class midpoints in the formula in place of X values, and first calculate the sample mean).