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find the mean deviation of 1 2 3 and 4 - JAMB Mathematics 2004 Question

find the mean deviation of 1, 2, 3 and 4
A
2.5
B
2.0
C
1.0
D
1.5
correct option: c

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

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