Question

The mean of a frequency distribution is 45.if the value of sigmafi=20 find sigmafixi

Answer 1

$\underline{\textbf{Given:}}$

$\textsf{Mean of a frequency distribution is 45}$

$\mathsf{and\;\Sigma\,f_i=20}$

$\underline{\textbf{To find:}}$

$\textsf{The value of}\;\mathsf{\Sigma\,f_i\,x_i}$

$\underline{\textbf{Solution:}}$

$\textsf{Formula for mean of a frequency distribution is}$

$\mathsf{Mean=\dfrac{\Sigma\,f_i\,x_i}{\Sigma\,f_i}}$

$\mathsf{45=\dfrac{\Sigma\,f_i\,x_i}{20}}$

$\implies\mathsf{\Sigma\,f_i\,x_i=45{\times}20}$

$\implies\boxed{\mathsf{\Sigma\,f_i\,x_i=900}}$

Answer 2

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