What is the mean deviation from the mean of the following observation: 9,9,2,3,

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Question

What is the mean deviation from the mean of the following observation:
9,9,2,3,6,9,4

Options:

A . 2.50

B . 2.62

C . 2.40

D . 2.57

Answer: Option D
Answer: (d).2.57

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