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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
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Correct Answer: Option C
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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