Probability - Jamb Mathematics Past Questions and Answers

Question 41:

• JAMB 1995

A die has four of it's faces coloured white and the remaining two coloured black. What is the probability that when the die is thrown two consecutive time, the top face will be white in both cases?

A. \(\frac{2}{3}\)
B. \(\frac{1}{9}\)
C. \(\frac{4}{9}\)
D. \(\frac{1}{36}\)

Question 42:

• JAMB 1995

Let p be a probability function on set S, where S = (a₁, a₂, a₃, a₄). Find P(a₁) if P(a₂) = \(\frac{1}{3}\), p(a₃) = \(\frac{1}{6}\) and p(a₄) = \(\frac{1}{5}\)

A. \(\frac{7}{3}\)
B. \(\frac{2}{3}\)
C. \(\frac{1}{3}\)
D. \(\frac{3}{10}\)

Question 43:

• JAMB 1995

A die has four of it's faces coloured white and the remaining two coloured black. What is the probability that when the die is thrown two consecutive time, the top face will be white in both cases?

A. \(\frac{2}{3}\)
B. \(\frac{1}{9}\)
C. \(\frac{4}{9}\)
D. \(\frac{1}{36}\)

Question 44:

• JAMB 1997

In a basket of fruits, 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. \(\frac{17}{30}\)
B. \(\frac{11}{30}\)
C. \(\frac{6}{30}\)
D. \(\frac{5}{30}\)

Question 45:

• JAMB 1997

A number is selected at random between 10 and 20, both numbers inclusive. Find the probability that the number is an even number

A. \(\frac{5}{11}\)
B. \(\frac{1}{2}\)
C. \(\frac{6}{11}\)
D. \(\frac{7}{10}\)