JAMB Mathematics 2009 Objective — Question 46

Question 46 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2009 Objective paper, with the correct answer and a full explanation.

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: 1,2,2,3. Mean deviation = sum|x-mean|/n = (1+0+0+1)/4 = 0.5.

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