Question:
The mean of a discrete frequency distribution $x_{i} / f_{i}, i=1,2$, $n$ is given by
(a) $\frac{\Sigma f_{i} x_{i}}{\Sigma f_{i}}$
(b) $\frac{1}{n} \sum_{n}^{n} f_{i=1} x_{i}$
(C) $\frac{\sum_{i=1} f_{i} x_{i}}{\sum_{i=1}^{n} x_{i}}$
(d) $\frac{\sum_{i=1}^{n} f_{i} x_{i}}{\sum_{1=1}^{n} i}$
Solution:
The mean of discrete frequency distribution is
$\bar{x}=\frac{\sum f_{i} x_{i}}{\sum f_{i}}$
Hence, the correct option is (a).