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16. The arithmetic mean of a series of 20 items wasăcalculated as 20. While calculating it, an item 13was measured as 30. The correct arithmetic mean1S |
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Answer» Total of these values = mean x number of items = 20 x 20 = 400.Now 13 was taken as 30, so the sum is 17 in excess.Actual sum = 400 - 17 = 383Mean = 383/20 = 19.15 |
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