The mean family income inWisconsin, 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 of your sample mean is between $71,000 and $77,531?
B) For this sample size, what is the probability that the sample mean exceeds $85,000?