The mean family income in Wisconsin, according to the 2011 data, is about $77,531, with a standard

Question:

The mean family income in Wisconsin, according to the 2011 data, is about $77,531, with a standard deviation (for the population) of approximately $59,750.
a. Imagine that you are taking a subsample of 200 state residents. What is the probability that your sample mean is between $71,000 and $77,531?
b. For this same sample size, what is the probability that the sample mean exceeds $85,000?