Find the Indicated Probability If One of These Customers Is Selected at Random, What

question 89

Multiple Choice

Find the indicated probability.
-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. $$\begin{array} { r | c } \begin{array} { r } \text { Waiting Time } \\\text { (minutes) }\end{array} & \begin{array} { c } \text { Number of } \\\text { Customers }\end{array} \\\hline 0 - 3 & 10 \\4 - 7 & 13 \\8 - 11 & 14 \\12 - 15 & 4 \\16 - 19 & 6 \\20 - 23 & 2 \\24 - 27 & 2\end{array}$$ If one of these customers is selected at random, what is the probability that their waiting time is at
Least 12 minutes or between 8 and 15 minutes?

• A)0.692
• B)0.078
• C)0.549
• D)0.627

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