Mean - Jamb Mathematics Past Questions and Answers

Question 26:

• JAMB 1992

\(\begin{array}{c|c} x & 2 & 4 & 6 & 8\\ \hline f & 4 & y & 6 & 5 \end{array}\)
If the mean of the above frequency distribution is 5.2, find y

A. 2, 1
B. 1, 2
C. 1, 5
D. 5, 2

Question 27:

• 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 28:

• JAMB 1994

The mean of twelve positive numbers is 3. When another number is added, the mean becomes 5. Find the thirteenth number

A. 29
B. 26
C. 25
D. 24

Question 29:

• JAMB 1994

\(\begin{array}{c|c} x & 1 & 2 & 3 & 4 & 5 \\ \hline f & y + 2 & y - 2 & 2y - 3 & y + 4 & 3y - 4\end{array}\)
This table shows the frequency distribution of a data if the mean is \(\frac{43}{14}\) find y

A. 1
B. 2
C. 3
D. 4

Question 30:

• JAMB 2001

Given the scores: 4, 7, 8, 11, 13, 8 with corresponding frequencies: 3, 5, 2, 7, 2, 1 respectively. The mean score is

A. 7.0
B. 8.7
C. 9.5
D. 11.0