If xi are the mid-points of the class intervals of grouped data, fi ar – InterviewSolution

1.	If xi are the mid-points of the class intervals of grouped data, fi are the corresponding frequencies and ¯x is the mean, then ∑fi(xi−¯x) is equal to ____.
Answer» If $x_{i}$ are the mid-points of the class intervals of grouped data, $f_{i}$ are the corresponding frequencies and $¯ x$ is the mean, then $\sum f_{i} (x_{i} - ¯ x)$ is equal to ____.

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