Probability - Jamb Mathematics Past Questions and Answers

Question 76:

• 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 77:

• 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 78:

• JAMB 2015

One bag contain 3 blue and 5 red balls, another bag contain 2 blue and 4 red balls respectively. One ball is drawn for each bag. What is the probability both balls are blue

A. \( \frac{2}{15} \)
B. \( \frac{3}{24} \)
C. \( \frac{3}{21} \)
D. \( \frac{3}{28} \)

Question 79:

• JAMB 2015

The probability of an event A is 1/5. The probability of B is 1/3 . The probability both A and B is 1/15. What is the probability of either event A or B or both

A. \( \frac{2}{15} \)
B. \( \frac{3}{4} \)
C. \( \frac{7}{15} \)
D. \( \frac{1}{15} \)

Question 80:

• 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