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
Please share this, thanks:
#JAMB #JAMB
Add your answer
No responses