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

1 answer

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