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

Question:

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

 

Solution:

we make the following table from the given data:

Therefore, $\overline{\mathrm{x}}=\frac{\sum_{\mathrm{i}=1}^{6} \mathrm{f}_{\mathrm{i}} \mathrm{x}_{\mathrm{i}}}{\sum_{\mathrm{i}=1}^{6} \mathrm{f}_{\mathrm{i}}}=\frac{12500}{100}=125$

 

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