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WageWeb is a service of HRPDI and provides compensation information on more than 170 benchmark positions in human resources. The October 2003 posting indicated that labor relation managers earn a mean annual salary of $87,500. Assume that annual salaries are normally distributed and have a standard deviation of $8875. (Give your answers correct to four decimal places.)
(a) What is the probability that a randomly selected labor relation manager earned more than $99,100 in 2003?
(b) A sample of 25 labor relation managers is taken, and annual salaries are reported. What is the probability that the sample mean annual salary falls between $85,000 and $88,900?
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