The following examination scores, arranged in ascending order, were achieved by 20 students enrolled in a decision analysis course 39, 46, 57, 65, 70, 72, 72, 75, 77,79, 81, 81, 4,87,93,94, 97, 97. Determine the (a) middle 90 per cent (b) middle 50 per cent range for these data.
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