Probability - Jamb Mathematics Past Questions and Answers

Question 61:

• JAMB 2005

What is the probability that an integer x,(1 \(\leq\) x \(\leq\) 20) chosen at random is divisible by both 2 and 3?

A. 1/20
B. 1/3
C. 3/20
D. 7/10

Question 62:

• JAMB 2006

A bag contains 5 black, 4 white and x red marbles. If the probability of picking a red marble is ²/₃, find the value of x

A. 8
B. 10
C. 4
D. 6

Question 63:

• JAMB 2006

The table above shows the distribution of recharge cards of four major GSM operators. What is the probability that a recharge card selected at random will be GTN or Qtel?

A. 3/20
B. 1/4
C. 2/5
D. 3/4

Question 64:

• JAMB 2007

In a basket, there are 6 grapes, 11 bananas and 13 oranges. If one fruit is chosen at random. What is the probability that the fruit is either a grape or a banana

A. ⁶/₃₀
B. ⁵/₃₀
C. ¹⁷/₃₀
D. ¹¹/₃₀

Question 65:

• JAMB 2007

The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?

A. ²⁷/₄₀
B. ¹⁷/₂₀
C. ³/₃₀
D. ³³/₄₀