Suppose we are told the sampling distribution developed from a sample of size 400 has a mean

Question:

Suppose we are told the sampling developed from a sample of size 400 has a mean of 56.78 and a standard error of 9.6. If the population is known to be normally distributed, what are the population mean and population standard deviation? Discuss how these values relate to the values for the sampling 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...