Question
If the algebraic sum of deviations of 20 observations from 30 is 20, then the mean of observations is
Answer: Option D
:
D
20∑i=1(xi−30)=20=20∑i=1xi−20×30=20
⇒20∑i=1xi=620.Mean=20∑i=120=62020=31.
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D
20∑i=1(xi−30)=20=20∑i=1xi−20×30=20
⇒20∑i=1xi=620.Mean=20∑i=120=62020=31.
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