The IRS was interested in the number of individual tax forms prepared by small accounting firms. The IRS randomly sampled 48 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
10 up to 20	4
20 up to 30	12
30 up to 40	22
40 up to 50	7
50 up to 60	3

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

Mean
Standard deviation