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The mean deviation of the data 2, 9, 9, 3, 6, 9, 4 from the mean is

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The mean deviation of the data 2, 9, 9, 3, 6, 9, 4 from the mean is

(A) 2.23 

(B) 2.57 

(C) 3.23 

(D) 3.57

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(B) is the correct answer

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