STATISTICS - Jamb Mathematics Past Questions and Answers

Question 161:

• JAMB 1994

Find the mean deviation of the set of numbers 4, 5, 9

A. Zero
B. 2
C. 5
D. 6

Question 162:

• JAMB 1994

\(\begin{array}{c|c} \text{Class Interval} & 1 - 5 & 6 - 10 & 11 - 15 & 16 - 20 & 21 - 25 \\ \hline Frequency & 6 & 15 & 20 & 7 & 2\end{array}\)
Estimate the median of the frequency distribution above

A. 10\(\frac{1}{2}\)
B. 11\(\frac{1}{2}\)
C. 12
D. 13

Question 163:

• 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 164:

• JAMB 1994

In a survey, it was observed that 20 students read newspapers and 35 read novels. If 40 of the students read either newspapers or novels, what is the probability of the students who read both newspapers and novels?

A. \(\frac{1}{2}\)
B. \(\frac{2}{3}\)
C. \(\frac{3}{8}\)
D. \(\frac{3}{11}\)

Question 165:

• JAMB 1995

\(\begin{array}{c|c} \text{Age in years} & 13 & 14 & 15 & 16 & 17 \\ \hline \text{No. of students} & 3 & 10 & 30 & 42 & 15\end{array}\)
The frequency distribution above shows the ages of students in a secondary school. In a pie chart constructed to represent the data, the angles corresponding to the 15 years old is

A. 27^o
B. 30^o
C. 54^o
D. 108^o