Question on: JAMB Mathematics - 2009
What is the mean deviation of x, 2x, x + 1 and 3x, if their mean is 2?
A
0.5
B
1.0
C
1.5
D
2.0
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Correct Option: D
deviation x - (\bar{x})
x - 2 + 2x - 2 + (x + 1) - 2 + 3x - 2 = 0
x - 2 + 2x - 2 -2x - 2 + 3x - 2 = 0
= 4x - 8
4x = 8
x = (\frac{8}{4})
= 2
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