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Show all work and answer A and B. The average teacher's salary in North Dakota is...

Show all work and answer A and B. The average teacher's salary in North Dakota is $37,764. Assume a normal distribution with a= $5100.
A. What is the probability that a randomly selected teacher's salary is greater than $40,000?
B. For a sample of 75 teachers, what is the probability that the sample mean is greater than $40,000?
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