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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.  Commute (in min)   Frequency 5052553558565812596113626411\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 min3.9 \mathrm {~min}
B) 6.6 min6.6 \mathrm {~min}
C) 2.5 min2.5 \mathrm {~min}
D) 55.7 min55.7 \mathrm {~min}

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