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10.A class of 160 students took a final examination in mathematics. The mean score was 68 and the standard deviation was 13. a)Determine the percentile

10.A class of 160 students took a final examination in mathematics. The mean score was 68 and the standard deviation was 13.

a)Determine the percentile rank of a score of 88, assuming that the marks were normally distributed.[2]

b) What is the probability that someone chosen at random had a mark between 57 and 74?[3]

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