Question 46

Jambmaths question: 

Find the mean deviation of 2, 4, 5 and 9

Option A: 

1

Option B: 

2

Option C: 

5

Option D: 

7

Jamb Maths Solution: 

$\begin{align} & mean=\overline{x}=\frac{2+4+5+9}{4}=5 \\ & mean\text{ }deviation=\frac{\left| 2-5 \right|+\left| 4-5 \right|+\left| 5-5 \right|+\left| 9-5 \right|}{4} \\ & =\frac{3+1+0+4}{4}=2 \\\end{align}$

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