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 If 99 7 of the ages are between 1 year and 14years, what is the standard deviation of car age Suppose the standard d...

75 each of the numbers 1 and 14 are 65 units away from ...

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

Question:

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 of ages of cars on U.S. roads is approximately bell-shaped. If 99.7% of the ages are between 1 year and 14years, what is the standard deviation of car age? Suppose the standard deviation is 1.7 years and the mean is 7.5 years. Between what two values would 95% of the car ages fall?

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...