An office manager has received a report from a consultant that includes

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QUESTION:

An office manager has received a report from a consultant that includes a section on equipment replacement. The report indicates that scanners have a service life that is normally distributed with a mean of 41 months and a standard deviation of 4 months. On the basis of this information, determine the percentage of scanners that can be expected to fail in the following time periods:

a. Before 38 months of service.

b. Between 40 and 45 months of service.

c. Within 2 months of the mean life.


 

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