Find the standard deviation of the following data -5, -4, -3, -2, -1, 0, 1,
PHYSICS
JAMB 1997
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 Answer: C. ?10
Explanation
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 = \(\sqrt{\frac{\sum(x - x)^2}{\sum f}}\)
= \(\sqrt{\frac{110}{11}}\)
= \(\sqrt{10}\)
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