The General Manager of the Service Department of a Television

Multiple Choice

The general manager of the Service Department of a television company has estimated that the time that elapses between the dates of purchase and the dates on which the 19-inch. sets manufactured by the company first require service is normally distributed with a mean of months and a standard deviation of months. ​
If the company gives a 1-year warranty on parts and labor for these sets, determine the percentage of sets manufactured and sold by the company that may require service before the warranty period runs out.
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A) percent sets may require service before the warranty period runs out.
B) percent sets may require service before the warranty period runs out.
C) percent sets may require service before the warranty period runs out.
D) percent sets may require service before the warranty period runs out.