The ages of 40 students are given in the following table: Find the arithmetic mean. contexto.140 3 years ago Solution:
![\[\begin{tabular}{|l|l|l|} \hline Age in yrs & Frequency & $\mathrm{f}_{\mathrm{i}} \mathrm{x}_{\mathrm{i}}$ \\ $\mathrm{x}_{\mathrm{i}}$ & $(\mathrm{fi})$ & \\ \hline 12 & 2 & 24 \\ \hline 13 & 4 & 52 \\ \hline 14 & 6 & 84 \\ \hline 15 & 9 & 135 \\ \hline 16 & 40 & 128 \\ \hline 17 & 7 & 119 \\ \hline 18 & 4 & 72 \\ \hline Total & 4 & 614 \\ \hline \end{tabular}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-c4f209c789fba969e0a17dfaaab33cf5_l3.png "Rendered by QuickLaTeX.com")
![\[\begin{tabular}{|l|l|l|l|l|l|l|l|} \hline Age( in yrs) & 12 & 13 & 14 & 15 & 16 & 17 & 18 \\ \hline Frequency & 2 & 4 & 6 & 9 & 8 & 7 & 4 \\ \hline \end{tabular}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-103ab26d9a975b82bb91071669a21be6_l3.png "Rendered by QuickLaTeX.com")
