SOLUTION: Suppose that the average score on the GMAT exam is 500 and that the standard deviation of all scores is 100 points. You would expect approximately 95% of all GMAT scores to be betw

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Question 852621: Suppose that the average score on the GMAT exam is 500 and that the standard deviation of all scores is 100 points. You would expect approximately 95% of all GMAT scores to be between
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

mean of 500 and a standard deviation of 100

You would expect approximately 95% of all GMAT scores to be between:

 NORMSINV(0.025)= -1.96,  z = ± 1.96  

 z = -.196 = (X-500)/100

     -19.6 + 500 = X = 480.4 = 481 rounded Up

 z = .196 = (X-500)/100

     19.6 + 500 = X = 519.6 = 520 rounded Up

Between 481 and 520