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)   (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
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