Measures of Location - Jamb Mathematics Past Questions and Answers

Question 31:

• JAMB 1981

7 pupils of average age 12 years leave a class of 25 pupils of average age 14 years. If 6 new pupils of average age 11years join the class, what is the average age of the pupils now in the class?

A. 13years
B. 12 years 7\(\frac{1}{2}\) months
C. 13 years 5 months
D. 13 years 10 months
E. 11 years

Question 32:

• JAMB 1982

Find the median of the set set of numbers 110, 116, 113, 119, 118, 127, 118, 117, 113

A. 117.5
B. 118
C. 117
D. 116
E. 113

Question 33:

• JAMB 1982

Determine the mean monthly salary of 50 employees of a company from the following frequency distribution.
\(\begin{array}{c|c} \text{Monthly salary} & \text{Frequency}\\\hline N200.00 & 10\\ N325.00 & 5\\N100.00 & 20\\N120.00 & 2\\ N60.00 & 10\\ N80.00 & 3\end{array}\)

A. N215.30
B. N134.10
C. N143.10
D. N80.00
E. N50.30

Question 34:

• 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 35:

• 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)