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 $88,000. Assume that annual salaries are normally distributed and have a standard deviation of $8550. (Give your answers correct to four decimal places.)

Question

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 $88,000. Assume that annual salaries are normally distributed and have a standard deviation of $8550. (Give your answers correct to four decimal places.) 
(a) What is the probability that a randomly selected labor relation manager earned more than $99,600 in 2003?

(b) A sample of 18 labor relation managers is taken, and annual salaries are reported. What is the probability that the sample mean annual salary falls between $85,600 and $88,900? 
 .5566 is my answer cant get a part though .

PsyDAG · Answer

Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

Tom 7 · Answer

thank you, I was using wrong formula but I got it right with your formula.