Find the Standard Deviation of the Data Summarized in the Given

Multiple Choice

Find the standard deviation of the data summarized in the given frequency distribution.
-A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation.
$$\begin{array} { r | c } \text { Salary (dollars) } & \text { Employees } \\\hline 5,001 - 10,000 & 11 \\10,001 - 15,000 & 14 \\15,001 - 20,000 & 11 \\20,001 - 25,000 & 17 \\25,001 - 30,000 & 27\end{array}$$

A) $7867.4
B) $8085.9
C) $7648.8
D) $7284.6