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    Calculating the standard deviation from a frequency table.

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    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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    Assuming uniform distribution within each salary range (local means are in the midpoints), ...