SOLUTION: Hi first time using this so hope i do this right! Question: A nationall administered test has a mean of 500 and a standard deviation of 100. If your standard score is 1.8, what

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Question 447611: Hi first time using this so hope i do this right!
Question: A nationall administered test has a mean of 500 and a standard deviation of 100. If your standard score is 1.8, what was your test score?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
A nationall administered test has a mean of 500 and a standard deviation of 100. If your standard score is 1.8, what was your test score?
z=%28x-mu%29%2Fsigma

z%2F1=%28x-mu%29%2Fsigma

Cross multiply:

x-mu=z%2Asigma

Add mu to both sides:

x=mu%2Bz%2Asigma

Substitute mu=500, z=1.8, and sigma=500

x=500%2B1.8%2A100

x=680
 
Edwin