a. Find the standard z-score such that 80% of the distribution is below (to the left of)

Question:

a. Find the standard z-score such that 80% of the is below (to the left of) this value.
b. Find the standard z-score such that the area to the right of this value is 0.15.
c. Find the two z-scores that bound the middle 50% of a normal 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...