Find the Range, Variance, and Standard Deviation for Each of the Two

Multiple Choice

Find the range, variance, and standard deviation for each of the two samples, then compare the two sets of results.
-A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation. $$\begin{array} { r | c } \text { Salary } & \text { Employees } \\\hline 5,001 - 10,000 & 11 \\10,001 - 15,000 & 15 \\15,001 - 20,000 & 19 \\20,001 - 25,000 & 10 \\25,001 - 30,000 & 25\end{array}$$

A) s = 7168.6
B) s = 7742.1
C) s = 7527.0
D) s = 7957.1