Variance - 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 2019

Score(x)	0	1	2	3	4	5	6
Freq(f)	5	7	3	7	11	6	7

Find the variance

A. 3.42
B. 4.69
C. 4.85
D. 3.72

Question 3:

• JAMB 2019

Score (x)	0	1	2	3	4	5	6
Freq (f)	5	7	3	7	11	6	7

Find the variance


A. 3.42
B. 4.69
C. 4.85
D. 3.72

Question 4:

• JAMB 1994

\(\begin{array}{c|c} x & 1 & 2 & 3 & 4 & 5 \\ \hline f & 2 & 1 & 2 & 1 & 2\end{array}\)
Find the variance of the frequency distribution above

A. \(\frac{3}{2}\)
B. \(\frac{9}{4}\)
C. \(\frac{5}{2}\)
D. 3

Question 5:

• JAMB 1995

The variance of the scores 1, 2, 3, 4, 5 is

A. 1, 2
B. 1, 4
C. 2.0
D. 3.0