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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 basket contains 30 apples. The probability of picking a rotten apple is 16. How many rotten apples are in the basket?

  1. 5
  2. 6
  3. 25
  4. 10
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Answer: A

Number of rotten apples = 30 * (16) = 5.

2. Which of the following values cannot represent the probability of an event?

  1. 1.25
  2. 0.75
  3. 0
  4. 45
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Answer: A

Probability values must be between 0 and 1 inclusive (0 ≤ P ≤ 1). 1.25 exceeds 1.

3. If the probability of it raining tomorrow is 0.28, what is the probability that it will NOT rain tomorrow?

  1. 0.72
  2. 0.28
  3. 0.82
  4. 0.62
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Answer: A

P(Not Rain) = 1 - P(Rain) = 1 - 0.28 = 0.72.

4. 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.

5. 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.

6. If an event is impossible to occur, what is its probability?

  1. 0
  2. 1
  3. 0.5
  4. -1
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Answer: A

The probability of an impossible event is always 0.

7. 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.

8. A coin is tossed 100 times, and heads appears 58 times. What is the experimental probability of getting heads?

  1. 0.58
  2. 0.50
  3. 0.42
  4. 0.10
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Answer: A

Experimental probability = Successful trials / Total trials = 58100 = 0.58.

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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