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[" 3.If "x(i)^( prime)" s are the mid po...

[" 3.If "x_(i)^( prime)" s are the mid points of the class intervals of grouped data,"f_(i)^( prime)" 's are the "],[" corresponding frequencies and "bar(x)" is the mean,then "sum(f_(i)x_(i)-bar(x))" is equal to "],[[" (A) "0," (B) "-1," (C) "1," (D) "2]]

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