Question

The mean of a discrete frequency distribution xᵢ/fᵢ; i = 1, 2, ..., n is given by
A.Σfᵢxᵢ/Σfᵢ
B.1/nnΣᵢ=1fᵢxᵢ
C.nΣi=1fixᵢ/nΣᵢ=1xᵢ
D.nΣi=1fixi/nΣi=1i

Answer 1

The mean of the discrete frequency distribution is : (A) ∑fixi/∑fi

• ∑fixi is the total quantity, or each value multiplied by its frequency.
• ∑fi is the total number of objects included to calculate mean.

Hence, dividing the two terms will give us the correct answer, that is the mean of the frequency distribution.