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Calculate the mean deviation of 1, 2, 3, 4, 5, 5, 6, 7, 8...

Calculate the mean deviation of 1, 2, 3, 4, 5, 5, 6, 7, 8, 9.

A.

2

B.

3

C.

4

D.

5

Correct answer is A

x 1 2 3 4 5 5 6 7 8 9 Total
xˉx -4 -3 -2 -1 0 0 1 2 3 4  
|xˉx| 4 3 2 1 0 0 1 2 3 4 20

Mean (ˉx) = 1+2+3+4+5+5+6+7+8+910=5010=5

MD=|xˉx|n=2010=2