The manager of a computer help desk operation has collected enough data to conclude that the amount of time per call is normally distributed with a mean of 8.21 mins and a standard deviation of 2.14 mins.

1. What is the probability a call will last longer than 13 minutes?
2. a.About 0.9875
3. b.About 0.5125
4. c.Approximately 0.000
5. d.About 0.0125
6. e.Approximately 0.4875

Please refer to the scenario described above

1. The manager has decided to have a signal system attached to each employee's phone that will emit a sound if an employee's callexceedsa particular time limit. The manager would like to set the time limit so the sound will occur on only 8 percent of all calls. The time limit should be set at:
2. a.around 10.35 mins.
3. b.around 12.49 mins.
4. c.about 14.58 mins.
5. d.about 11.37mins.
6. e.approximately 5.19 mins.