9th class Math, Chapter 13: Probability MCQs

1. Each element of the sample space is called:

1. (A) event
2. (B) experiment
3. (C) sample point ✓
4. (D) outcomes

2. An outcome which represents how many times we expect the things to be happened is called:

1. (A) outcomes
2. (B) favourable outcome ✓
3. (C) sample space
4. (D) sample point

3. Which one tells us how often a specific event occurs relative to the total number of frequency event or trials?

1. (A) expected frequency
2. (B) sum of relative frequency
3. (C) relative frequency ✓
4. (D) frequency

4. Estimated probability of an event occurring is also known as:

1. (A) relative frequency ✓
2. (B) expected frequency
3. (C) class boundaries
4. (D) sum of expected frequency

5. The sum of all expected frequencies is equal to the fixed number of:

1. (A) trials ✓
2. (B) relative frequencies
3. (C) outcomes
4. (D) events

6. The chance of occurrence of a particular event is called:

1. (A) sample space
2. (B) estimated probability
3. (C) probability ✓
4. (D) expected frequency

7. An event which will probably occur, and has greater chance to occur, is called:

1. (A) equally likely event
2. (B) likely event ✓
3. (C) unlikely event
4. (D) certain event

8. The total number of possible outcomes when 4 dice are rolled is:

1. (A) 6²
2. (B) 6³
3. (C) 6⁴ ✓
4. (D) 6⁶

9. While rolling a pair of dice, the probability of a double 2 is:

1. (A) 1/6
2. (B) 1/3
3. (C) 5/6
4. (D) 1/36 ✓

10. A card is chosen from a pack of 52 playing cards. The probability of getting no jack and no king is:

1. (A) 2/13
2. (B) 11/13 ✓
3. (C) 2/52
4. (D) 11/52

11. The probability of an event A is:

1. (A) n(S)/n(A)
2. (B) n(A) + n(S)
3. (C) n(A) × n(S)
4. (D) n(A)/n(S) ✓

12. The set of all possible outcomes of an experiment is called the:

1. (A) sample point
2. (B) sample space ✓
3. (C) event
4. (D) favourable outcome

13. The sample space of tossing a coin is:

1. (A) {T}
2. (B) {1, 2}
3. (C) {H, T} ✓
4. (D) {H}

14. The sample space of rolling a die is:

1. (A) {1, 2, 3, 4, 5, 6} ✓
2. (B) {1, 2, 3, 4, 5}
3. (C) {0, 1, 2, 3, 4, 5, 6}
4. (D) {2, 4, 6}

15. The probability of an impossible event is:

1. (A) 1
2. (B) 0.5
3. (C) −1
4. (D) 0 ✓

16. The probability of a certain event is:

1. (A) 0
2. (B) 0.5
3. (C) 100
4. (D) 1 ✓

17. The probability of equally likely events (like head or tail in one toss) is:

1. (A) 1
2. (B) 0.25
3. (C) 0.5 ✓
4. (D) 0

18. The probability of any event A satisfies:

1. (A) P(A) > 1
2. (B) P(A) < 0
3. (C) −1 ≤ P(A) ≤ 1
4. (D) 0 ≤ P(A) ≤ 1 ✓

19. An experiment is the process which:

1. (A) generates results ✓
2. (B) adds probabilities
3. (C) counts events
4. (D) draws graphs

20. The probability of getting an even number when a die is rolled is:

1. (A) 2/3
2. (B) 1/2 ✓
3. (C) 1/3
4. (D) 1/6