The Manager of a Bank Recorded the Amount of Time

question 88

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. $$\begin{array}{l}\begin{array} { r | r } \text { Waiting Time } & \text {Number of }\\\text { (minutes) } & \text { Customers } \\\hline 0 - 3 & 11 \\4 - 7 & 14 \\8 - 11 & 12 \\12 - 15 & 8 \\16 - 19 & 4 \\20 - 23 & 3 \\24 - 27 & 2\end{array}\end{array}$$
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) 0.741
• B) 0.685
• C) 0.537
• D) 0.148

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