Approximate the Variance and Standard Deviation of a Variable from Grouped

question 113

Multiple Choice

Approximate the Variance and Standard Deviation of a Variable from Grouped Data
-For the following data set, approximate the sample standard deviation of commuting times per day. $\begin{array}{c|c}\text { Commute (in min) } & \text { Frequency } \\\hline 50-52 & 5 \\53-55 & 8 \\56-58 & 12 \\59-61 & 13 \\62-64 & 11\end{array}$

• A) \(3.9 \mathrm {~min}\)
• B) \(6.6 \mathrm {~min}\)
• C) \(2.5 \mathrm {~min}\)
• D) \(55.7 \mathrm {~min}\)

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