Using the empirical rule, determine the approximate percentage of a normal distribution that is expected to fall

Question:

Using the empirical rule, determine the approximate percentage of a normal that is expected to fall within the interval described.
a. Less than the mean
b. Greater than 1 standard deviation above the mean
c. Less than 1 standard deviation above the mean
d. Between 1 standard deviation below the mean and 2 standard deviations above the mean
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...