Probability - Jamb Mathematics Past Questions and Answers

Question 46:

• JAMB 1998

A bag contains 16 red balls and 20 blue balls only. How many white balls must be added to the bag so that the probability of randomly picking a red ball is equal to \(\frac{2}{5}\)

A. 4
B. 20
C. 24
D. 40

Question 47:

• JAMB 1998

In a recent zonal championship games involving 10 teams, teams X and Y were given probabilities \(\frac{2}{5}\) and \(\frac{1}{3}\) respectively of winning the gold in the football event. What is the probability that either team will win the gold?

A. \(\frac{2}{15}\)
B. \(\frac{7}{15}\)
C. \(\frac{11}{15}\)
D. \(\frac{13}{15}\)

Question 48:

• JAMB 1998

If x, y can take values from the set (1, 2, 3, 4), find the probability that the product of x and y is not greater than 6

A. \(\frac{5}{8}\)
B. \(\frac{5}{16}\)
C. \(\frac{1}{2}\)
D. \(\frac{3}{8}\)

Question 49:

• JAMB 2000

In a youth club with 94 members, 60 like modern music, and 50 like traditional music. The number of members who like both traditional and modern music is three times those who do not like any type of music. How many members like only one type of music?

A. 8
B. 24
C. 62
D. 86

Question 50:

• JAMB 2000

X and Y are two events. The probability of X or Y is 0.7 and that of X is 0.4. If X and Y are independent, find the probability of Y.

A. 0.30
B. 0.50
C. 0.57
D. 1.80