If the mean of the numbers 0, (x+2), (3x+6), and (4x+8) is 4, find their
MATHEMATICS
JAMB 2000
If the mean of the numbers 0, (x+2), (3x+6), and (4x+8) is 4, find their mean deviation.
- A. 0
- B. 2
- C. 3
- D. 4
Correct Answer: C. 3
Explanation
Mean = {0 + (x+2) + (3x+6) + (4x+8)}/4 = 4
=> 0 + (x+2) + (3x+6) + (4x+8) = 16
8x + 16 = 16
x = 0
Now prepare a table showing the deviation of each of 0, (x+2), (3x+6) and (4x+8), adding the deviations will give 12.
Thus M.D = 12/4 = 3
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