SOLUTION: Question 4 Unsaved For a population with μ = 80 and σ = 10, what is the X value corresponding to z = –2.00? 78 75 70 60

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Question 4 Unsaved For a population with μ = 80 and σ = 10, what is the X value corresponding to z = –2.00? 78 75 70 60      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1117259: Question 4 Unsaved
For a population with μ = 80 and σ = 10, what is the X value corresponding to z = –2.00?
78

75

70

60
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
if mean = 80 and s = 10, and a z-score of -2, this means that the raw score is 2 standard deviations below the mean, therefore equal to 60.

z = (x - m) / s

-2 = (x - 80) / 10

solve for x to get x = -20 + 80 = 60.