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The mean deviation of the data 2, 9, 9, ...

The mean deviation of the data 2, 9, 9, 3, 6, 9, 4 from the mean is :
A. `(42)/(7)`
B. `(18)/(7)`
C. `2.5`
D. `(50)/(7)`

A

2.23

B

2.57

C

3.23

D

3.57

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The correct Answer is:
B
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