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.
-The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency distribution below summarizes the results. Find the standard deviation. Round your answer to one decimal place. $$\begin{array}{l}\text { Waiting tim\& Number of }\\\begin{array} { c | c } \text { (minutes } & \text { customer } \\\hline 0 - 3 & 12 \\4 - 7 & 14 \\8 - 11 & 10 \\12 - 15 & 13 \\16 - 19 & 0 \\20 - 23 & 1\end{array}\end{array}$$

A) 4.9
B) 5.2
C) 7.0
D) 4.7