The Manager of a Bank Recorded the Amount of Time

question 45

Multiple Choice

The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency table below summarizes the results. $$\begin{array} { | l | l | } \hline \begin{array} { l } \text { Waiting Time } \\\text { (minutes) }\end{array} & \begin{array} { l } \text { Number of } \\\text { Custemers }\end{array} \\\hline 0 - 3 & 9 \\\hline 4 - 7 & 10 \\\hline 8 - 11 & 12 \\\hline 12 - 15 & 4 \\\hline 16 - 19 & 4 \\\hline 20 - 23 & 2 \\\hline 24 - 27 & 2 \\\hline\end{array}$$ If we randomly select one of the customers represented in the table, what is the probability
That the waiting time is at least 12 minutes or between 8 and 15 minutes?

• A)0.558
• B)0.651
• C)0.093
• D)0.727

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