Math 110 Name:

Quiz 10

 

Assume that at a particular company, the amount of time that customers are left on hold is normally distributed with a mean of 180 seconds and a standard deviation of 20 seconds.

  1. What percentage of their customers wait on hold for less than 180 seconds?

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  2. What percentage of customers wait on hold for more than 220 seconds?

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  3. For what percentage of the customers is the wait time between 170 and 190 seconds?