Use the Grouped Data Formulas to Find the Indicated Mean

question 119

Multiple Choice

Use the grouped data formulas to find the indicated mean or standard deviation.
-The manager of a bank recorded the amount of time a random sample of customers spent waiting in line during peak business hours one Monday. The frequency distribution below summarizes the results.
Approximate the sample mean. Round your answer to one decimal place.
714 $$\begin{array} { c | c } \begin{array} { c } \text { Waiting time } \\\text { (minutes) }\end{array} & \begin{array} { c } \text { Number of } \\\text { customers }\end{array} \\\hline 0 - 3 & 12 \\4 - 7 & 14 \\8 - 11 & 13 \\12 - 15 & 6 \\16 - 19 & 8 \\20 - 23 & 2 \\24 - 27 & 1\end{array}$$ 312

• A)9.1 min
• B)13.5 min
• C)8.0 min
• D)9.2 min

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