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Find the mean deviation of the set of numbers 4, 5, 9

Find the mean deviation of the set of numbers 4, 5, 9
  • A.
    zero
  • B.
    2
  • C.
    5
  • D.
    6
Correct Answer: Option B
Explanation

x = (frac{sum x}{N})
= (frac{18}{3})
= 6
(begin{array}{c|c} x & x – x & x – x \ hline 4 & -2 & 2\ 5 & 1 & 1\ 9 & 3 & 3\ hline & & 6end{array})
M.D = (frac{|x – x|}{N})
= (frac{6}{3})
= 2

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