When we compute the z-score of a sample mean, (a) What must you compute first? (b) What

Question:

When we compute the z-score of a sample mean,
(a) What must you compute first?
(b) What is its formula?
(c) What is the formula for the z-score of a sample 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...