SOLUTION: A mean score on a standardized test is 50 with a standard deviation of 10. What percentile of scores falls between +1 and +2 standard deviations?

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Question 830799: A mean score on a standardized test is 50 with a standard deviation of 10.
What percentile of scores falls between +1 and +2 standard deviations?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
P%281s%29=0.84135
P%282s%29=0.97725
P%282s%29-P%281s%29=0.97725-0.84135=0.135905
13.5% of the scores fall between 1 and 2 standard deviations.