Mathematics - Statistics Question with Solution | TestHub

Mean $\bar{x}=\frac{\sum x}{n}$ or $\Sigma x=n\bar{x}$ $\Sigma \mathrm{x}=25\times 78.4=1960$ But this $\Sigma \mathrm{x}$ is incorrect as 96 was misread as 69 . $\begin{array}{rl}& \therefore \text{ correct }\Sigma \mathrm{x}=1960+(96-69)=1987\\ & \therefore \text{ correct mean }=\frac{1987}{25}=79.48\end{array}$