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Question 3If x′is are the mid-points of the calss intervals of grouped data, f′is are the corresponding frequencies and ¯x is the mean, then ∑(fixi−¯x) is equal to(a) 0(b) -1(c) 1(d) 2

Answer» Question 3

If x′is are the mid-points of the calss intervals of grouped data, f′is are the corresponding frequencies and ¯x is the mean, then ∑(fixi−¯x) is equal to

(a) 0

(b) -1

(c) 1

(d) 2


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