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Question Number 183117 by Subhabrata last updated on 20/Dec/22

Answered by Rasheed.Sindhi last updated on 21/Dec/22

$$\overline{)\begin{array}{cccc}Class& x_i& f_i& x_i{f}_i\\ 30-39& 34.5& 2& 69\\ 40-49& 44.5& 3& 133.5\\ 50-59& 54.5& 11& 599.5\\ 60-69& 64.5& 20& 1290\\ 70-79& 74.5& f_5& 74.5f_5\\ 80-89& 84.5& 25& 2112.5\\ 90-99& 94.5& 7& 661.5\\ & & \underset{=68+f_5}{\mathrm{\Sigma }{f}_i}& \underset{=4866+74.5f_5}{\mathrm{\Sigma }{x}_i{f}_i}\end{array}}$$$$A.M.=\frac{\mathrm{\Sigma }{x}_i{f}_i}{\mathrm{\Sigma }{f}_i}=\frac{4866+74.5f_5}{68+f_5}=72.5$$$$4866+74.5f_5=4930+72.5f_5$$$$f_5=\frac{4930-4866}{2}=32$$

Answered by cortano1 last updated on 21/Dec/22

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