Question

The mean of a discrete frequency distribution x_i / f_i, i = 1, 2, ......, n is given by

(a) $\frac{\mathrm{\Sigma }{f}_i{x}_i}{\mathrm{\Sigma }{f}_i}$
(b) $\frac{1}{n}\sum _{i=1}^n{f}_i{x}_i$
(c) $\frac{{\displaystyle \sum _{i=1}^n}{f}_i{x}_i}{{\displaystyle \sum _{i=1}^n}{x}_i}$
(d) $\frac{{\displaystyle \sum _{i=1}^n}{f}_i{x}_i}{{\displaystyle \sum _{1=1}^n}i}$

Answer 1

The mean of discrete frequency distribution is

Hence, the correct option is (a).