A random variable follows the normal probability distribution with a mean of 80 and a standard deviation

Question:

A random variable follows the normal probability distribution with a mean of 80 and a standard deviation of 20. What is the probability that a randomly selected value from this population

a. Is less than 90?

b. Is less than 65?

c. Is more than 110?

d. Is more than 40?

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...