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The algebraic sum of the deviation of 20 observations from 30 is 2.Therefor, what is the mean of this observatio? |
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Answer» tion:Let the 20 deviations be a 1 ,a 2 ,...,a 20 THEREFORE the observations are (30+a 1 ),(30+a 2 ),...,(30+a 20 )Given that sum of the deviations is 2Therefore, a 1 +a 2 +...+a 20 =2 ------(1)Hence, MEAN= 20(30+a 1 )+(30+a 2 )+...+(30+a 20 ) ⟹mean= 20a 1 +a 2 +...+a 20 +20(30) ⟹mean= 202+20(30) (from (1))⟹mean= 20602 =30.1 mark kr do brainlist |
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