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100 students take an exam. Of those, 7 are drawn at random. Those 7 students earn the following scores: 85 80 91 72 97 68

100 students take an exam. Of those, 7 are drawn at random. Those 7 students earn the following scores:

85 80 91 72 97 68 84

Find the mean score, the median score and the standard deviation.

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