1.

The mean deviation of the numbers 3, 4, 5, 6, 7 from the mean is A. 25 B. 5 C. 1.2 D. 0

Answer»

The mean deviation of the numbers 3, 4, 5, 6, 7

Mean \(\bar X = \frac{3+4+5+6+7}{5}\) 

\(\bar X = \frac{25}{5}\) 

\(\bar X = 5\)

Xi(xi - mean)
3-2
4-1
50
61
72
\(\Sigma x_i = 25\) \(\Sigma d_i = 0\)

Mean deviation = \(\frac{\Sigma d_i}{\Sigma x_i}\) 

Mean deviation = \(\frac{0}{25}\) 

Hence, Mean deviation is 0


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