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If xi’s are the mid points of the class intervals of grouped data, fi’s are the corresponding frequencies and x is the mean, then (fixi – ¯¯¯ x ) is equal to (A)0 (B) –1 (C) 1 (D) 2

(A) 0

Clarification:

Mean (x) = Sum of the relative multitude of perceptions/Number of perceptions

   

   

   

   

   

   

   

   

   

Henceforth, choice (A) is right