Can someone please help me get the answers that were given in class. I keep trying but are unable to arrive at these answers.
-According to the Bureau of Labor Statistics, the average weekly pay for a U.S. production worker was $441.84. Assume that available data indicate that production worker wages were normally distributed with a standard deviation of $90.
a.) What is the probability that a worker earned between $400 and $500? Answer: .4194
b.) How much did a production worker have to earn to be in the top 20 % of wage earners? My answer: 517.44 or more
c.) For a randomly selected production worker, what is the probability the worker earned less than $250 per week?
Answer: .0166