Question

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

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

0-4                   20

4-8                   25

8-12                 30

12-16               20

16-24               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).

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