What percentage of values in a normal distribution will be a. Between the mean and a point

Question:

What percentage of values in a normal will be
a. Between the mean and a point 1.36 standard deviations to the right of the mean?
b. In an interval that starts at 1.25 standard deviations to the left of the mean and extends to 1.65 standard deviations to the right of the mean?
c. Beyond 2.1 standard deviations to the right of the mean?
d. In an interval that starts at 1.56 standard deviations to the right of the mean and ends at 2.18 standard deviations to the right of 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...