The IRS was interested in the number of individual tax forms prepared by small accounting firms. The IRS randomly sampled 52 public accounting firms with 10 or fewer employees in the Dallas-Fort Worth area. The following frequency table reports the results of the study.
Number of Clients Frequency
15 up to 40 3
40 up to 65 13
65 up to 90 22
90 up to 115 10
115 up to 140 4
Mean
Standard deviation