Find the Indicated Probability by Using the General Addition Rule

question 116

Multiple Choice

Find the indicated probability by using the general addition rule.
-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.
$\begin{array}{l}\text { Waiting Time Number of }\\\begin{array} { c | c } \text { (minutes) } & \text { Customers } \\\hline 0 - 3 & 10 \\4 - 7 & 15 \\8 - 11 & 15 \\12 - 15 & 8 \\16 - 19 & 7 \\20 - 23 & 2 \\24 - 27 & 2\end{array}\end{array}$
If we randomly select one of the times represented in the table, what is the probability that it is at Least 12 minutes or between 8 and 15 minutes?

• A)0.712
• B)0.136
• C)0.719
• D)0.576

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