Q. 85.0( 3 Votes )

# If x_{i}'s are the midpoints of the class intervals of a grouped data, f_{i}'s are the corresponding frequencies and 7 is the mean then

A. 1

B. 0

C. - 1

D. 2

Answer :

If mean = 7, x_{i}’s = midpoints of the class intervals and f_{i} = corresponding frequencies

Mean is given by,

⇒

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Or

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