SOLUTION: An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for: a) a test score of 232 b) a test score of 212 Help please?????

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Question 184791This question is from textbook
: An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for: a) a test score of 232 b) a test score of 212
Help please????? This question is from textbook

Answer by Edwin McCravy(20059) About Me  (Show Source):
You can put this solution on YOUR website!
An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for: a) a test score of 232 b) a test score of 212
Help please????? 

The formula for a z-score for a test score of x
with mean mu and standard deviation sigma
is  

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

So for

a) a test score of 232

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

z=%28232-220%29%2F10

z=%2812%29%2F10

z=1.2

and for

b) a test score of 212

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

z=%28212-220%29%2F10

z=%28-8%29%2F10

z=-.8

Edwin