Jamb Mathematics 2020 Past Questions and Answers

Question 21:

• JAMB 2020

Calculate the standard deviation of the following data: 7, 8, 9, 10, 11, 12, 13

A. 2
B. 4
C. 12
D. 17

Question 22:

• JAMB 2020

A number is selected at random between 20 and 30, both numbers inclusive. Find the probability that the number is a prime.

A. \(\frac{2}{11}\)
B. \(\frac{5}{11}\)
C. \(\frac{6}{11}\)
D. \(\frac{8}{11}\)

Question 23:

• JAMB 2020

The equation of the line in the graph is

A. 3y = 3x + 12
B. 3y = 3x + 12
C. 3y = -4x + 12
D. 3y = -4x + 9

Question 24:

• JAMB 2020

Express the product of 0.0014 and 0.011 in standard form

A. 1.54 x 10\(^{-2}\)
B. 1.54 x 10\(^{-3}\)
C. 1.54 x 10\(^{-2}\)
D. 1.54 x 10\(^{-5}\)

Question 25:

• JAMB 2020

A school boy lying on the ground 30m away from the foot of a water tank towel observes that the angle of elevation of the top of the tank is 60\(^o\). Calculate the height of the tank.

A. 60\(\sqrt{3m}\)
B. 30\(\sqrt{3m}\)
C. 20\(\sqrt{3m}\)
D. 10\(\sqrt{3m}\)