If the mean of frequency distribution is 34.9, Σfixi = 1000 + a, Σfi = 30 then the value of a = ______.

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If the mean of frequency distribution is 34.9, Σfixi = 1000 + a, Σfi = 30 then the value of a = 47. Explanation: Mean = (Σf_i x_i)/(Σf_i), So, Σfixi = 34.9 $\times$ 30 = 1047 Given Σfixi = 1000 + a, We have 1000 + a = 1047 $\Rightarrow$ a = 47

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