Question:
Find the mean deviation about the mean for the following data
Solution:
we make the following table from the given data:
Therefore
$\overline{\mathrm{X}}=\frac{\sum_{\mathrm{i}=1}^{6} \mathrm{f}_{\mathrm{i}} \mathrm{x}_{\mathrm{i}}}{\sum_{\mathrm{i}=1}^{6} \mathrm{f}_{\mathrm{i}}}$
$\frac{12500}{100}=125$