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Class 9–10 Maths: Probability practice questions

Practise probability for Classes 9 and 10. Try the 10-question quiz below and see each answer explained straight away, then read all 12 worked examples with answers underneath. Free, no sign-up.

Probability: worked examples with answers

These Maths questions are generated, so a fresh set appears every time you press "Practise more questions". Here are some worked examples.

1. A bag holds 5 red, 6 blue and 5 green balls. One ball is picked at random. What is the probability it is red?

   1. A. 5/17
   2. B. 5/16 ✓
   3. C. 3/8
   4. D. 11/16

   Answer: 5/16. Probability = favourable ÷ total = 5/16.

2. A bag holds 2 red, 6 blue and 2 green balls. One ball is picked at random. What is the probability it is red?

   1. A. 2/11
   2. B. 3/5
   3. C. 4/5
   4. D. 1/5 ✓

   Answer: 1/5. Probability = favourable ÷ total = 2/10 = 1/5.

3. A bag holds 3 red, 2 blue and 2 green balls. One ball is picked at random. What is the probability it is red?

   1. A. 4/7
   2. B. 2/7
   3. C. 3/7 ✓
   4. D. 3/2

   Answer: 3/7. Probability = favourable ÷ total = 3/7.

4. A bag holds 1 red, 1 blue and 5 green balls. One ball is picked at random. What is the probability it is red?

   1. A. 1/7 ✓
   2. B. 2/7
   3. C. 6/7
   4. D. 1/8

   Answer: 1/7. Probability = favourable ÷ total = 1/7.

5. A bag holds 1 red, 4 blue and 4 green balls. One ball is picked at random. What is the probability it is red?

   1. A. 1/4
   2. B. 1/10
   3. C. 4/9
   4. D. 1/9 ✓

   Answer: 1/9. Probability = favourable ÷ total = 1/9.

6. A bag holds 3 red, 3 blue and 3 green balls. One ball is picked at random. What is the probability it is red?

   1. A. 2/3
   2. B. 1/3 ✓
   3. C. 4/9
   4. D. 1

   Answer: 1/3. Probability = favourable ÷ total = 3/9 = 1/3.

7. A bag holds 2 red, 4 blue balls. One ball is picked at random. What is the probability it is red?

   1. A. 1/2
   2. B. 2/7
   3. C. 2/3
   4. D. 1/3 ✓

   Answer: 1/3. Probability = favourable ÷ total = 2/6 = 1/3.

8. A bag holds 4 red, 6 blue balls. One ball is picked at random. What is the probability it is red?

   1. A. 1/2
   2. B. 2/3
   3. C. 2/5 ✓
   4. D. 3/5

   Answer: 2/5. Probability = favourable ÷ total = 4/10 = 2/5.

9. A bag holds 3 red, 3 blue and 4 green balls. One ball is picked at random. What is the probability it is red?

   1. A. 3/10 ✓
   2. B. 1
   3. C. 7/10
   4. D. 2/5

   Answer: 3/10. Probability = favourable ÷ total = 3/10.

10. A bag holds 2 red, 2 blue and 3 green balls. One ball is picked at random. What is the probability it is red?

    1. A. 3/7
    2. B. 2/7 ✓
    3. C. 5/7
    4. D. 1/4

    Answer: 2/7. Probability = favourable ÷ total = 2/7.

11. A bag holds 2 red, 1 blue and 5 green balls. One ball is picked at random. What is the probability it is red?

    1. A. 2
    2. B. 3/4
    3. C. 2/9
    4. D. 1/4 ✓

    Answer: 1/4. Probability = favourable ÷ total = 2/8 = 1/4.

12. A bag holds 1 red, 3 blue and 4 green balls. One ball is picked at random. What is the probability it is red?

    1. A. 7/8
    2. B. 1/3
    3. C. 1/9
    4. D. 1/8 ✓

    Answer: 1/8. Probability = favourable ÷ total = 1/8.

More Class 9–10 Maths topics

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