MCQ Probability Part 1

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Q1 A bag contains 3 red balls, 5 white balls and 7 black balls. What is the probability that a ball drawn from the bag at random will be neither red nor black?

1 point

(A) 1/5

(B) 1/3

(D) 8/15

2. If an event cannot occur, then its probability is
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1 point

(A) 1

(B) 3/4

(D) 0

3. Which of the following cannot be the probability of an event?
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1 point

(A) 1/3

(B) 0.1

(D) 17/16

4. An event is very unlikely to happen. Its probability is closest to
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1 point

(A) 0.0001

(B) 0.001

(D) 0.1

5. If the probability of an event is p, the probability of its complementary event will be
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1 point

(A) p – 1

(B) p

(D) 1- 1/p

6. The probability expressed as a percentage of a particular occurrence can never be
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1 point

(A) less than 100

(B) less than 0

(D) anything but a whole number

7. If P(A) denotes the probability of an event A, then
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1 point

(A) P(A) < 0

(B) P(A) > 1

(D) –1=<P(A) >= 1

8. A card is selected from a deck of 52 cards. The probability of its being a red face card is
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1 point

(A) 3/26

(B) 3/13

(D) 1/2

9. The probability that a non leap year selected at random will contain 53 sundays is
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1 point

(A) 1/7

(B) 2/7

(D) 5/7

10. When a die is thrown, the probability of getting an odd number less than 3 is
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1 point

(A) 1/6

(B) 1/3

(D) 0

11. A card is drawn from a deck of 52 cards. The event E is that card is not an ace of hearts. The number of outcomes favourable to E is
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1 point

(A) 4

(B) 13

(D) 51

12. The probability of getting a bad egg in a lot of 400 is 0.035. The number of bad
eggs in the lot is
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1 point

(A) 7

(B) 14

(D) 28

13. A girl calculates that the probability of her winning the first prize in a lottery is 0.08. If 6000 tickets are sold, how many tickets has she bought?
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1 point

(A) 40

(B) 240

(D) 750

14. One ticket is drawn at random from a bag containing tickets numbered 1 to 40. The probability that the selected ticket has a number which is a multiple of 5 is
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1 point

(A) 1/5

(B) 3/5

(D) 1/3

15. Someone is asked to take a number from 1 to 100. The probability that it is a
prime is
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1 point

(A) 1/5

(B)6/25

(D) 13/50

16. A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is
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1 point

(A) 4/23

(B)6/23

(D) 17/23

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