Mathematics

What is the mean deviation of x, 2x, x+1 and 3x. If their mean is…

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: Option A
Explanation
xx x-X/x-X/
x1-11
2x200
x+1200
3x311
∑/x-X/=2
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