the following examination scores arranged in ascending order were achived by 20 students enrolled in decision analysis course 39,46,57,65,70,72,7275,77,79,81,81,84,84,87,93,94,97,97 determine the middle 90 pecentage and middle 50 percent range of these data
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one observation is missing which is 85 for getting the book answer because total observation is 20 but given is only 19 that's why we can't get answer
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