Find the mean deviation about the mean for the following data :

Question:

Find the mean deviation about the mean for the following data :

 

Solution:

Therefore, $\overline{\mathrm{X}}=\frac{\sum_{\mathrm{i}=1}^{7} \mathrm{f}_{\mathrm{i}} x_{\mathrm{i}}}{\sum_{\mathrm{i}=1}^{7} \mathrm{f}_{\mathrm{i}}}=\frac{3100}{50}=62$

 

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