The following frequency table summarizes the distances in

Question

The following frequency table summarizes the distances in miles of 100 patients from a regional hospital.

Distance         Frequency

0-2                  30

2-4                  35

4-6                  20

6-8                  10

8-10                 5

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).