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

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