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The algebraic sum of deviations of 10 ob...

The algebraic sum of deviations of 10 observations measured from 15 is 7 The mean is

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Algebric sum of deviations ` = 7`
Total number of observations ` = 10`
`:.` Mean `= 7/10 = 0.7`
Measured deviation ` = 15`
But, here observation starts from `15`.
`:.` Actual mean ` = 15+0.7 = 15.7`
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