Probability Class 12 MCQs Questions with Answers

1. An experiment has 10 equally likely outcomes. Let A and B be two non-empty events of the experiment. A consists 4 outcomes, the number of outcomes that B must have so that A and B are independent is

2. For the following probability distribution, the standard deviation of the random variable X is

3. Which of the following conditions do Bernoulli trials satisfy?

4. If A and B are two events and A ≠ Φ, B ≠ Φ, then

5. If two events are independent, then

6. A pair of dice are rolled. The probability of obtaining an even prime number on each dice is

7. The conditional probability of an event E, given the occurrence of the event F

8. The probability of a man hitting a target is 1/4. How many times must he fire so that the probability of his hitting the target at least once is greater than 2/3?

9.

10. If the event A and B are independent, then P(A∩B) is equal to

11.

12. The probability distribution of a discrete random variable X is given below:

The value of k is

13. If P(a) = 0,4, P(b) = 0.8 and P(B|A) = 0.6 then P(A∪B) is equal to

14.

15.

16. If A and B are two independent events, then the probability of occurrence of at least of A and B is given by

17. An urn contains five balls. Two balls are drawn and found to be white. The probability that all the balls are white is:​

18. Let E and F be events of a sample space S of an experiment, then P(E’/F) = ___

19. If a, b and c are all distinct and the

20. Two cards are drawn at random and without replacement from a pack of 52 playing cards. Find the probability that both the cards are black.