145 is one s.d. above the mean
68% of scores are in this range
34% are above the mean
50% of scores are below the mean
that leaves 16% of scores above 145
assume that a set of test scores is normally distributes with a mean of 120 and a standard deviation of 25. use the 68-95-99.7 rule to find the percentage of scores greater tha 145
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