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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.
 Waiting Time Number of  (minutes)   Customers 0−3104−7158−111512−15816−19720−23224−272\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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