A research agency administers a demographic survey to 90 telemarketing companies to determine the size of their operations. When asked to report how many employees now work in their telemarketing operation, the companies gave responses ranging from 1 to 100. The agency’s analyst organizes the figures into a frequency distribution.

Number of EmployeesNumber of

Working in Telemarketing ......Companies

0–under 20 .............32

20–under 40 ............16

40–under 60 ...........13

60–under 80 ............10

80–under 100 .............19

a. Compute the mean, median, and mode for this distribution.

b. Compute the sample standard deviation for these data.