The mean of a discrete frequency distribution $\large\frac{x}{f_i}$$; i=1,2,3,.n$ is given by

Question

$(A) \; \large\frac{\sum \limits_{i=1}^{n} f_i x_i}{\sum \limits_{i=1}^{n} fi} \\(B)\; \frac{1}{n} \sum \limits_{i=1}^{n} f_i x_i \\(C)\; \large\frac{\sum \limits_{i=1}^{n} f_i x_i}{\sum \limits_{i=1}^{n} xi} \\(D)\;\large\frac{\sum \limits_{i=1}^{n} f_i x_i}{\sum \limits_{i=1}^{n} i}$