find the mean deviation of 1, 2, 3 and 4
A
2.5
B
2.0
C
1.0
D
1.5
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
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
Source: Myschool Past Questions Archive (Record #8190)