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On a standardized national exam, the mean score was 55.5 and the standard deviation was 6.2. What percentage of the students scored higher than 61.7?
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Explanation & Answer
Standard Deviation (SD) is the measure of spread of the numbers in a set of data from its mean value.
55.5+6.2=61.7
6.2/100 is the variance
50-6.2=43.8
=43.8%
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