Sampling Distribution
Complete solutions and illustrations are required.
1.The average annual salary for all U.S. teachers is $29,863. Assume that the distribution is normal and the standard deviation is $5,200.
a.Find the probability that a randomly selected teacher earns at least $35,000 a year.
b.What is the probability that the mean for a sample of 80 teachers’ salaries is greater than $30,000?