Suppose That, on Average, Electricians Earn Approximately µ = $54,000

Multiple Choice

Suppose that, on average, electricians earn approximately µ = $54,000 per year in the United States. Assume that the distribution for electricians' yearly earnings is normally distributed and that the standard deviation is σ = $12,000 dollars. What is the probability that the average salary of four randomly selected electricians is more than $50,000 but less than $60,000?

A) 0.5889
B) 0.7486
C) 0.8413
D) 0.9048