In 2011, the mean property crime rate (per 100,000 people) for the 10 states in the Northeast

Question:

In 2011, the mean property crime rate (per 100,000 people) for the 10 states in the Northeast was 2400; the standard deviation was 400. Assume the distribution of property crime rates is approximately unimodal and symmetric.

a. Approximately what percentage of northeastern states would you expect to have property crime rates between 1600 and 3200?

b. Approximately what percentage of northeastern states would you expect to have property crime rates between 2000 and 2800?

c. If someone guessed that the property crime rate in one northeastern state was 400, would you agree that number was consistent with this data set?

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...