Question

The mean of a discrete frequency distribution xi / fi, i = 1, 2, ......, n is given by
(a)Σ fixi/Σ fi
(b)1n∑i=1nfi xi
(c)∑i=1n fixi∑i=1n xi
(d)∑i=1nfixi∑1=1ni

Answer 1

SOLUTION : The correct option is (a) : Σfixi /Σfi

The mean of discrete frequency distribution is : Σfixi /Σfi

[‘Σ’ (sigma) means 'Summation’.]

MEAN = Sum of the values of all the observations/ Total number of observations

DISCRETE SERIES : A series having observations x1, x2, x3 ,......xn with respective frequencies f1, f2 , f3 …..,fn is known as discrete series.

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