For the Following Data Set, Approximate the Sample Standard Deviation

Multiple Choice

For the following data set, approximate the sample standard deviation of monthly telephone bills (in dollars) . $$\begin{array} { c | c } \text { Bill (in \$) } & \text { Frequency } \\\hline 50 - 52 & 2 \\53 - 55 & 5 \\56 - 58 & 12 \\59 - 61 & 19 \\62 - 64 & 7\end{array}$$

A) $3.11
B) $58.60
C) $93.12
D) $9.65