STATISTICS - Jamb Mathematics Past Questions and Answers

Question 91:

• JAMB 1982

The arithmetic mean of the ages of 30 pupils in a class is 15.3 years. One boy leaves the class and one girl is enrolled, and the new average age of 30 pupils in the class becomes 15.2 years. How much older is the boy than the girl?

A. 30 years
B. 6 years
C. 9 years
D. 3 years
E. 1 year

Question 92:

• JAMB 1983

If M represents the median and D the mode of the measurements 5, 9, 3, 5, 7, 5, 8 then (M, D) is

A. (6, 5)
B. (5, 8)
C. (5, 7)
D. (5, 5)
E. (7, 5)

Question 93:

• JAMB 1983

If M represents the median and D the mode of the measurements 5, 9, 3, 5, 7, 5, 8 then (M, D) is

A. (6, 5)
B. (5, 8)
C. (5, 7)
D. (5, 5)
E. (7, 5)

Question 94:

• JAMB 1983

The scores of set of final year students in the first semester examination in a paper are 41, 29, 55, 21, 47, 70, 70, 40, 43, 56, 73, 23, 50, 50. Find the median of the scores.

A. 47
B. 50
C. 48\(\frac{1}{2}\)
D. 48
E. 49

Question 95:

• JAMB 1983

Find the missing value in the following table \(\begin{array}{c|c} x & -2 & -1 & 0 & 1 & 2 & 3 \\ \hline Y = x^3 - x + 3 & & 3 & 3 & 3 & 9 & 27\end{array}\)

A. -3
B. 3
C. -9
D. 13
E. 9