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4. A class of 135 students took a nal examination in mathematics. The mean score on the examination was 68% with a standard deviation of

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4. A class of 135 students took a nal examination in mathematics. The mean score on the examination was 68% with a standard deviation of 8.5 %. Determine the percentile rank of each of the following people: a) Joey, who scored 78% b) Shaheed, who got 55% c) Michelle, who was very happy with her mark of 89%

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