Question on: JAMB Mathematics - 2007

What is the mean deviation of 3, 5, 8, 11, 12 and 21?

A
4.7
B
60
C
3.7
D
10
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Correct Option: A

Mean (= \bar{x} = \frac{60}{6} = 10)

mean deviation (= \frac{\sum|x-\bar{x}|}{n} = \frac{28}{6})

= 4.7

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