Question 1140939
The difference between 631 and 514 is 117.
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117 divided by 117 is 1.  Therefore, a score of 631 is exactly one standard deviation above the mean.
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Either by using a z-table or using the 68-95-99.7 rule, the area to the left of the curve from one standard deviation above the mean is about 84%.
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So, there's an 84% chance a randomly selected student has a score of 631 points or less.