In a large city it was found that summer electricity bills for single-family homes followed a normal

Question:

In a large city it was found that summer electricity bills for single-family homes followed a normal with a standard deviation of $100. A random sample of 25 bills was taken.
a. Find the probability that the sample standard deviation is less than $75.
b. Find the probability that the sample standard deviation is more than $150. 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...