find the mean deviation of 1, 2, 3 and 4
-
A.
2.5 -
B.
2.0 -
C.
1.0 -
D.
1.5
Correct Answer: Option C
Explanation
X = 1, 2, 3, 4; ∑X = 10
x = ∑X/n = 10/4 = 2.5
X – x = -1.5, -0.5, 0.5, 1.5
lX – xl = 1.5, 0.5, 0.5, 1.5; ∑lX – xl = 4.0
mean deviation = (∑lX – xl)/n
= 4.0/4
= 1.0