JAMB Math Quiz 6

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

• 8

• 10

• 4

• 6

What is the probability of picking the letter 'T' from the word OBSTRUCTION?

• 1/11

• 2/11

• 3/11

• 4/11

The result of rolling a fair die 150 times is summarized in a table. If the number 5 appeared 15 times, what is the probability of obtaining a 5?

• 3/10

• 1/5

• 1/6

• 1/10

The probability of a student passing any examination is 2/3. If the student takes three examinations, what is the probability that he will not pass any of them?

• 2/3

• 4/9

• 8/27

• 1/27

The table below shows the distribution of marks of students in a test: Marks: 2 3 4 5 6 7 8 9 Number of students: 3 4 1 0 4 5 2 1 What is the probability of passing the test if the pass mark is 5?

• 3/5

• 2/5

• 7/20

• 1/5

A bag contains 5 black balls and 3 red balls. Two balls are picked at random without replacement. What is the probability that a black and a red ball are picked?

• 15/28

• 13/28

• 5/14

• 3/14

The probabilities that events A and B occur are P(A) = 1/5 and P(B) = 1/3. If P(A and B) = 1/15, what is the probability of A or B occurring?

• 2/15

• 3/4

• 7/15

• 1/15

The probabilities that a man and his wife live for 80 years are 2/3 and 3/5 respectively. What is the probability that at least one of them lives up to 80 years?

• 2/15

• 3/15

• 7/15

• 13/15

A student has a 2/3 chance of passing a Physics test. If he takes 3 tests, what is the probability that he passes exactly 2 of them?

• 2/27

• 3/27

• 4/27

• 12/27

A die is tossed once. What is the probability of getting a number greater than 4?

• 1/6

• 1/3

• 1/2

• 2/3