# Calculating the standard deviation from a frequency table.

Find the standard deviation of the data in the given frequency table. A company had 80 employees whose salaries are summarized in the frequency table below. Find the standard deviation.

Salary / Employees

5001-10000 / 17

10001-15000 / 16

15001-20000 / 20

20001-25000 /15

25001-30000 /12

#### Solution Preview

... the estimated mean first,

<br>

<br>X = (17*7500+16*12500+20*17500+15*22500+12*27500)/80 = ...