Question:
Find the mean deviation about the mean for the following data :
Solution:
we make the following table form the given data
Therefore, $\overline{\mathrm{X}}=\frac{\sum_{\mathrm{i}=1}^{7} \mathrm{f}_{\mathrm{i}} x_{\mathrm{i}}}{\sum_{\mathrm{i}=1}^{7} \mathrm{f}_{\mathrm{i}}}=\frac{3100}{50}=62$