What is the probability that waiting time is twelve minutes

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Problem 1: The manager of a bank recorded the amount of time each customer spent waiting in line during one business hour on a Monday. The frequency table below summarizes the results.

Waiting Times(minutes)           Number of Customers

0-3                                                  11

4-7                                                    9

8-11                                                11

12-15                                               5

16-19                                                 5

20-23                                                  1

24-27                                                 3

Problem 2: 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? Round to the nearest thousandth.

Option 1: 0.556

Option 2: 0.667

Option 3: 0.111

Option 4: 0.727

Reference no: EM132723095

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