The mean of a discrete frequency distrib...

The mean of a discrete frequency distribution `x_i//f_i ; i=1,\ 2,\ ddot,\ n` is given by (a) `(sumf_i x_i)/(sumf_i)` (b) `1/n\ sum_(i=1)^nf_i x_i` (c) `(sumi=1nf_i x_i)/(sumi=1n x_i)` (d) `(sumi=1nf_i x_i)/(sumi=1n i)`

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