SOLUTION: This question is from the book Statistics for Business and Economics. Please help me finish the problems. I can't figure it. Business week conducted a survey of graduates from 3

Question 164445: This question is from the book Statistics for Business and Economics. Please help me finish the problems. I can't figure it.
Business week conducted a survey of graduates from 30 top MBA programs. On the basis of the survey assume that the mean annual salary for male and female graduates 10 years after graduation is $168,000 and $117,000, respectively. Assume that standard deviation for the male graduates is $40,000, and for the female graduates it is $25,000.
What is the probability that a simple random sample of 100 male graduates will provide a sample mean more than $4000 below the population mean?
(P(X<164,000) males
n=100
U=168,000
O=40,000
Z=164,000-168,000 over 40,000 over square root of 100. (I can't figure what to do next)
Answer by themathprof(21) (Show Source): You can put this solution on YOUR website!
It looks like your z=-1.00
You're looking for 'more than' or to the right of z=-1.00
The probability of z=-1 to z=0 is .3413
The prob of z=0 to the right is .5000
Added together you get .8413
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