Find the mean deviation of the set of numbers 4, 5, 9
A
zero
B
2
C
5
D
6
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
x = \(\frac{\sum x}{N}\)
= \(\frac{18}{3}\)
= 6
\(\begin{array}{c|c} x & x - x & x - x \\ \hline 4 & -2 & 2\\ 5 & 1 & 1\\ 9 & 3 & 3\\ \hline & & 6\end{array}\)
M.D = \(\frac{|x - x|}{N}\)
= \(\frac{6}{3}\)
= 2
Source: Myschool Past Questions Archive (Record #31121)