Find the standard deviation of the following da... - JAMB Physics 1997 Question
Find the standard deviation of the following data -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5
A
2
B
3
C
√10
D
√11
correct option: c
x = \(\frac{\sum x}{N}\) = \(\frac{0}{11}\)
= 0
\(\begin{array}{c|c} x & (x - x) & (x - x)^2\ \hline -5 & -5 & 25 \ -4 & -4 & 16\-3 & -3 & 9\ -2 & -2 & 4\ -1 & -1 & 1\ 0 & 0 & 0 \1 & 1 & 1\ 2 & 2 & 4 \ 3 & 3 & 9 \ 4 & 4 & 16\ 5 & 5 & 25 \ \hline & & 110\end{array}\)
S.D = \(\sqrt{\frac{\sum(x - x)^2}{\sum f}}\)
= \(\sqrt{\frac{110}{11}}\)
= \(\sqrt{10}\)
= 0
\(\begin{array}{c|c} x & (x - x) & (x - x)^2\ \hline -5 & -5 & 25 \ -4 & -4 & 16\-3 & -3 & 9\ -2 & -2 & 4\ -1 & -1 & 1\ 0 & 0 & 0 \1 & 1 & 1\ 2 & 2 & 4 \ 3 & 3 & 9 \ 4 & 4 & 16\ 5 & 5 & 25 \ \hline & & 110\end{array}\)
S.D = \(\sqrt{\frac{\sum(x - x)^2}{\sum f}}\)
= \(\sqrt{\frac{110}{11}}\)
= \(\sqrt{10}\)
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