Measures Of Dispersion - Mathematics Jamb Past Questions and Answers

Question 16 :

• 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 17 :

• JAMB 1995

\(\begin{array}{c|c} class& 1 - 3 & 4 - 6 & 7 - 9\\ \hline Frequency & 5 & 8 & 5\end{array}\)
Find the standard deviation of the data using the table above

A. 5
B. \(\sqrt{60}\)
C. \(\frac{5}{3}\)
D. \(\sqrt{5}\)

Question 18 :

• 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

Question 19 :

• JAMB 1995

\(\begin{array}{c|c} class& 1 - 3 & 4 - 6 & 7 - 9\\ \hline Frequency & 5 & 8 & 5\end{array}\)
Find the standard deviation of the data using the table above

A. 5
B. \(\sqrt{60}\)
C. \(\frac{5}{3}\)
D. \(\sqrt{5}\)

Question 20 :

• 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