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Question 4 If the mean score of 100 groups of students in an admission test is 20.2 out of 30 with a standard deviation of

Question 4 If the mean score of 100 groups of students in an admission test is 20.2 out of 30 with a standard deviation of 2.2, without assuming a normal distribution, within what range will at least 75% of the mean score of the admission test fall

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