Mathematics 2019 Jamb Past Questions and Answers

Question 81 :

• JAMB 2019

If \(\sin x = \frac{4}{5}\), find \(\frac{1 + \cot^2 x}{\csc^2 x - 1}\).

A. \(\frac{13}{2}\)
B. \(\frac{25}{9}\)
C. \(\frac{3}{13}\)
D. \(\frac{4}{11}\)

Question 82 :

• JAMB 2019

A binary operation \(\otimes\) is defined by \(m \otimes n = mn + m - n\) on the set of real numbers, for all m, n \(\in\) R. Find the value of 3 \(\otimes\) (2 \(\otimes\) 4).

A. 6
B. 25
C. 15
D. 18

Question 83 :

• JAMB 2019

Age in years	7	8	9	10	11
No of pupils	4	13	30	44	9

The table above shows the number of pupils in a class with respect to their ages. If a pie chart is constructed to represent the age, the angle corresponding to 8 years old is

A. 48.6°
B. 56.3°
C. 46.8°
D. 13°

Question 84 :

• JAMB 2019

Age in years	7	8	9	10	11
No of pupils	4	13	30	44	9

The table above shows the number of pupils in a class with respect to their ages. If a pie chart is constructed to represent the age, the angle corresponding to 8 years old is

A. 48.6°
B. 56.3°
C. 46.8°
D. 13°

Question 85 :

• JAMB 2019

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

Find the mean of the data.


A. 3.26
B. 4.91
C. 6.57
D. 3.0