2009
Mathematics
JAMB
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
Correct Answer: 0.5
Explanation
Mean = x+2x+x+1+3x/4 2 =7x+1/4 8 = 7x+1 7x = 8-1 7x = 7 x = 1 Mean deviation =∑/x-X/n =2/4 =1/2 = 0.5
Mean = x+2x+x+1+3x/4 2 =7x+1/4 8 = 7x+1 7x = 8-1 7x = 7 x = 1 Mean deviation =∑/x-X/n =2/4 =1/2 = 0.5THIS WEEK's
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