company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 45 months and a standard deviation of 4 months. Using the empirical (68-95-99.7) rule, what is the approximate percentage of cars that remain in service between 49 and 57 months? Caution: Using tables or Excel for this may produce a wrong answer. Use the 68-95-99.7 rule. Answer = % (Do not enter the percent symbol or round your answer. This asks for a percentage so do not convert to decimal. For example, for 99%, you would enter 99, not 0.99)
A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 45 months and a standard deviation of 4 months. Using the empirical (68-95-99.7) rule, what is the approximate percentage of cars that remain in service between 49 and 57 months?
Caution: Using tables or Excel for this may produce a wrong answer. Use the
Answer = % (Do not enter the percent symbol or round your answer. This asks for a percentage so do not convert to decimal. For example, for 99%, you would enter 99, not 0.99)
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