JAMB Mathematics 2008 Objective — Question 43
Question 43 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2008 Objective paper, with the correct answer and a full explanation.
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What is the mean deviation of x, 2x, x+1 and 3x, if their mean is 2?
- A. 0.5Correct
- B. 1.0
- C. 1.5
- D. 2.0
Explanation
Mean = (x+2x+x+1+3x)/4 = (7x+1)/4 = 2. 7x+1=8. x=1. Values are 1,2,2,3. Mean deviation = sum|value-mean|/n = (1+0+0+1)/4 = 0.5.
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