Jamb Mathematics 2019 Past Questions and Answers

Question 86:

• JAMB 2019

Score (x)	0	1	2	3	4	5	6
Freq (f)	5	7	3	7	11	6	7

Find the variance


A. 3.42
B. 4.69
C. 4.85
D. 3.72

Question 87:

• JAMB 2019

The marks scored by 30 students in a Mathematics test are recorded in the table below:

Scores (Mark)	0	1	2	3	4	5
No of students	4	3	7	8	6	2

What is the total number of marks scored by the children?


A. 82
B. 15
C. 63
D. 75

Question 88:

• JAMB 2019

If \(f(x) = 3x^3 + 4x^2 + x - 8\), what is the value of f(-2)?

A. -24
B. 30
C. -18
D. -50

Question 89:

• JAMB 2019

Tade bought 200 mangoes at 4 for #2.50. 30 out of the mangoes got spoilt and the remaining were sold at 2 for #2.40. Find the percentage profit or loss.

A. 43.6% loss
B. 35% profit
C. 63.2% profit
D. 28% loss

Question 90:

• JAMB 2019

In the diagram above, O is the centre of the circle ABC, < ABO = 26° and < BOC = 130°. Calculate < AOC.

A. 26°
B. 13°
C. 80°
D. 102°