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Quiz Chapter 13: Simple Probability

10 questions · Form 2 Mathematics Bab 13: Simple Probability

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. A bag contains cards numbered 1 to 15. What is the probability of selecting a square number?

  1. 15
  2. 415
  3. 13
  4. 215
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Answer: A

Perfect square numbers between 1 and 15 are {1, 4, 9} (3 numbers). P(Square) = 315 = 15.

2. Two coins are tossed at the same time. Find the probability of getting at least one head.

  1. 34
  2. 12
  3. 14
  4. 1
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Answer: A

Sample space S = {HH, HT, TH, TT}, n(S) = 4. Outcomes with at least one H = {HH, HT, TH} (3 outcomes). P(At least 1 H) = 34.

3. A bag contains 5 red balls, 3 blue balls, and 2 green balls. What is the probability of drawing a blue ball?

  1. 0.3
  2. 0.5
  3. 0.2
  4. 0.8
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Answer: A

Total balls n(S) = 5 + 3 + 2 = 10. Blue balls n(Blue) = 3. P(Blue) = 310 = 0.3.

4. What is the probability of getting a sum of 13 when two fair six-sided dice are rolled simultaneously?

  1. 0
  2. 136
  3. 112
  4. 16
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Answer: A

The maximum possible sum when rolling two dice is 6 + 6 = 12. Getting 13 is impossible, so probability is 0.

5. A number is picked at random from integers 1 to 20 inclusive. What is the probability of picking a multiple of 4?

  1. 14
  2. 15
  3. 12
  4. 310
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Answer: A

Multiples of 4 between 1 and 20 are {4, 8, 12, 16, 20} (5 numbers). P(Multiple of 4) = 520 = 14.

6. A spinner has 8 equal sections numbered 1 to 8. What is the probability of spinning a number greater than 5?

  1. 38
  2. 58
  3. 12
  4. 14
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Answer: A

Numbers greater than 5 are {6, 7, 8} (3 numbers). P(> 5) = 38.

7. A fair die is rolled. Find the probability of getting a prime number.

  1. 0.5
  2. 0.33
  3. 0.67
  4. 0.17
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Answer: A

Prime numbers on a die are 2, 3, 5 (3 favorable outcomes). P(Prime) = 36 = 0.5.

8. The probability that a target is hit is 0.85. If 200 shots are fired, how many shots are expected to hit the target?

  1. 170
  2. 150
  3. 160
  4. 180
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Answer: A

Expected count = Probability * Total trials = 0.85 * 200 = 170.

9. A letter is chosen at random from the word 'MALAYSIA'. What is the probability of selecting the letter 'A'?

  1. 38
  2. 18
  3. 28
  4. 48
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Answer: A

Word length n(S) = 8. 'A' appears 3 times. P('A') = 38.

10. In a class of 40 students, 24 are girls. If a student is picked at random, find the probability of picking a boy.

  1. 25
  2. 35
  3. 14
  4. 12
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Answer: A

Number of boys = 40 - 24 = 16. P(Boy) = 1640 = 25.

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