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Friday, 14 August 2026
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Mathematics Past Questions and Answers

Topic: Standard deviation

Jamb Mathematics Questions - Standard deviation

Question 1:
Find the standard deviation of 5, 4, 3, 2, 1
  • A \(\sqrt{2}\)
  • B \(\sqrt{3}\)
  • C \(\sqrt{6}\)
  • D \(\sqrt{10}\)
View Answer & Explanation
Question 2:
If the variance of 3+x, 6, 4, x and 7-x is 4 and the mean is 5, find the standard deviation
  • A \(\sqrt{3}\)
  • B 2
  • C 3
  • D \(\sqrt{2}\)
View Answer & Explanation
Question 3:
If the scores of 3 students in a test are 5, 6 and 7, find the standard deviation of their scores
  • A \(\frac{2}{3}\)
  • B \(\frac{2}{3}\sqrt{3}\)
  • C \(\sqrt{\frac{2}{3}}\)
  • D \(\sqrt{\frac{3}{2}}\)
View Answer & Explanation
Question 4:
Calculate the standard deviation of the following data: 7, 8, 9, 10, 11, 12, 13.
  • A 2
  • B 4
  • C 10
  • D 11
View Answer & Explanation
Question 5:
\(\begin{array}{c|c} class& 1 - 3 & 4 - 6 & 7 - 9\\ \hline Frequency & 5 & 8 & 5\end{array}\)
Find the standard deviation of the data using the table above
  • A 5
  • B \(\sqrt{60}\)
  • C \(\frac{5}{3}\)
  • D \(\sqrt{5}\)
View Answer & Explanation