Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records

Question:

Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 minutes and the standard deviation of this is 14 minutes. Suppose 100 returns from this year are selected and analyzed regarding the preparation time.
What is the probability that the mean time for the sample of 100 returns is between 88 minutes and 92 minutes?
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...