Find the mean deviation of 2 4 5 and 9 - JAMB Mathematics 2008 Question
Find the mean deviation of 2, 4, 5 and 9
A
1
B
2
C
5
D
7
correct option: b
\(\begin{array}{c|c} x & f & fx & x - \bar{x} & f(x - \bar{x}) \ \hline 2 & 1 & 2 & -3 & -3 & 3\ 4 & 1 & 4 & -1 & 1 & 1\ 5 & 1 & 5 & 0 & 0 & 0 \9 & 1 & 9 & 4 & 4 & 4 \ \hline & 4 & 20 & & & 8 \end{array}\)
x = \(\frac{\sum fx}{\sum fx}\)
= \(\frac{20}{4}\)
= 5
MD = \(\frac{\sum f(x - \bar{x})}{\sum f}\)
= \(\frac{8}{4}\)
= 2
x = \(\frac{\sum fx}{\sum fx}\)
= \(\frac{20}{4}\)
= 5
MD = \(\frac{\sum f(x - \bar{x})}{\sum f}\)
= \(\frac{8}{4}\)
= 2
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