Mathematics, 18.02.2020 03:07 Adeenieweenie

The Polk Company reported that the average age of a car on U. S. roads in a recent year was 7.5 years. Suppose the distribution of ages of cars on U. S. roads is approximately bell-shaped. (a) If 99.7% of the ages are between 1 year and 14 years, what is the standard deviation of car age? (5 points) (b) Suppose

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The Polk Company reported that the average age of a car on U. S. roads in a recent year was 7.5 year...