Question 46
Measures of DispersionWhat 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
Show the answer and explanation
Answer: A (0.5)
Explanation
(7x + 1)/4 = 2 gives x = 1, so the numbers are 1, 2, 2, 3. The absolute deviations from 2 are 1, 0, 0, 1, so the mean deviation = 2/4 = 0.5.