Probability - Jamb Mathematics Past Questions and Answers

Question 16:

• JAMB 2015

The probability of an outcome A is 1/6 . The probability of the B outcome is 1/4 . If the probability of A or B or both is 1/12 . What is the probability of both outcomes A and B?

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

Question 17:

• JAMB 2014

\(\begin{array}{c|c}
Numbers & 1 & 2 & 3 & 4 & 5 & 6 \\
\hline
Frequency & 18 & 22 & 20 & 16 & 10 & 14
\end{array}\)
The table above represents the outcome of throwing a die 100 times. What is the probability of obtaining at least a 4?

A. \(\frac{1}{5}\)
B. \(\frac{1}{2}\)
C. \(\frac{2}{5}\)
D. \(\frac{3}{4}\)

Question 18:

• JAMB 2014

A number is chosen at random from 10 to 30 both inclusive. What is the probability that the number is divisible by 3?

A. \(\frac{2}{15}\)
B. \(\frac{1}{10}\)
C. \(\frac{1}{3}\)
D. \(\frac{2}{5}\)

Question 19:

• JAMB 2013

What is the probability that an integer x \((1 \leq x \leq 25)\) chosen at random is divisible by both 2 and 3?

A. \(\frac{1}{25}\)
B. \(\frac{1}{5}\)
C. \(\frac{4}{25}\)
D. \(\frac{3}{4}\)

Question 20:

• JAMB 2013

A basket contains 9 apples, 8 bananas and 7 oranges. A fruit is picked from the basket, find the probability that it is neither an apple nor an orange.

A. \(\frac{3}{8}\)
B. \(\frac{1}{3}\)
C. \(\frac{7}{24}\)
D. \(\frac{2}{3}\)