Standard deviation - Jamb Mathematics Past Questions and Answers

Question 1:

• JAMB 1979

The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is

A. 1.5
B. 0.8
C. 1.0
D. 1.02
E. 1.05

Question 2:

• JAMB 2014

Find the standard deviation of 5, 4, 3, 2, 1

A. \(\sqrt{2}\)
B. \(\sqrt{3}\)
C. \(\sqrt{6}\)
D. \(\sqrt{10}\)

Question 3:

• JAMB 2013

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. \(\sqrt{2}\)

Question 4:

• JAMB 1992

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. \(\sqrt{\frac{3}{2}}\)

Question 5:

• JAMB 1993

Calculate the standard deviation of the following data: 7, 8, 9, 10, 11, 12, 13.

A. 2
B. 4
C. 10
D. 11