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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2005
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Q)
Let $x_1, x_2 , . . . . x_n$ be $n$ observation such that $ \Sigma x_i^2 = 400 $ and $ \Sigma x_i = 80$. Then a possible value of $n$ among the following is :
( A ) 9
( B ) 15
( C ) 18
( D ) 12
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