SOLUTION: In a distribution for which the mean is 25 and the standard deviation is 5, what percentage of all scores occur at 30 or above?
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Question 1023357: In a distribution for which the mean is 25 and the standard deviation is 5, what percentage of all scores occur at 30 or above?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Scores 30 and above occur at greater than or equal to one standard deviation above the mean.
We know 68.2% of a sample fits within one standard deviation. Thus the part more than 1 s.d. is (1/2)(100% - 68.2%) = (1/2)(31.8%) = 15.9%
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