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11) The average scores of 20 students in statistics test is 90 with standard deviation of 5. In this data set unusual observation are scores

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11) The average scores of 20 students in statistics test is 90 with standard deviation of 5. In this data set unusual observation are scores that lie outside the region of: a) (80, 100) b) O (75, 105) c) O (85, 95) d) 0 (70, 110)

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