Question

The IRS was interested in the number of individual tax forms prepared by small accounting firms....

The IRS was interested in the number of individual tax forms prepared by small accounting firms. The IRS randomly sampled 50 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

40 up to 70

3

70 up to 100

15

100 up to 130

22

130 up to 160

6

160 up to 190

4


Estimate the mean and the standard deviation. (Round squared deviations to nearest whole number and final answer to 2 decimal places.)
  Mean

  

  Standard deviation

  

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Date Given : No. of clients Freguaeos 3 oo uptu 136 22 130 upto 160 160 upto 190 the mean Stanard dleviatian mid point S 5 8 5 15 2 53 01IS-11O 2 )18 No . of client 165 (55-1,0,3)5114 oo upts 3022 >70 700 |(145-11-8)2-1170 (125-1108广ー4122 145 、 SS4O Mean (1) 4, 3 2 3 Standard devicuhion Co) 29.1 4o upt 70 70 upp 700 | 1.5 too upjo 13 22 9g o 3 36 76 20 Ansal I> Mean.//o :8一 2) Standayd 130 upto 16 o 176 6 488 6 29.4

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