STATISTICS - Jamb Mathematics Past Questions and Answers

Question 151:

• JAMB 1993

The following marks were obtained by twenty students in an examination: 53, 30, 70, 84, 59, 43, 90, 20, 78, 48, 44, 60, 81, 73, 50, 37, 67, 68, 64, 52. Find the numbers of students who scored at least 50 marks

A. 6
B. 10
C. 13
D. 14

Question 152:

• JAMB 1993

\(\begin{array}{c|c} Weight(s) & 0 -10 & 10 - 20 & 20 - 30 & 40 - 50\\ \hline \text{Number of coconuts} & 10 & 27 & 19 & 6 & 2\end{array}\)
Estimate the mode of the frequency distribution above

A. 13.2g
B. 15.0g
C. 16.8g
D. 17.5g

Question 153:

• JAMB 1993

The mean of the ages of ten secondary school pupils is 16 but when the age of their teacher is added to it the men becomes 19. Find the age of the teacher

A. 27
B. 35
C. 38
D. 49

Question 154:

• JAMB 1993

\(\begin{array}{c|c} Class & Frequency\\ \hline 1 - 5 & 2\\6 - 10 & 4\\11 - 15 & 5\\16 - 20 & 2 \\ 21 - 25 & 3\\26 - 30 & 2\\31 - 35 & 1\\36 - 40 & 1 \end{array}\)
Find the median of the observation in the table given

A. 11.5
B. 12.5
C. 14.0
D. 14.5

Question 155:

• JAMB 1993

A number is selected at random between 20 and 30, both numbers inclusive. Find the probability that the number is a prime

A. \(\frac{2}{11}\)
B. \(\frac{5}{11}\)
C. \(\frac{6}{11}\)
D. \(\frac{8}{11}\)