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20-03-2021
Mathematics

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The sum of deviations of n observations about 25 is 25 and the sum of deviations of the same n observations about 35 is −25. The mean of observations.

The sum of deviations of n observations about 25 is 25 and the sum of deviations of the same n observations about 35 is 25 The mean of observations class=

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20-03-2021

Answer:

30

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