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Standard deviation calculation by frequency table

Assignment:

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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Mathematics: Standard deviation calculation by frequency table

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