Class 9 Mathematics Chapter 7: The Mathematics of Maybe: Introduction to Probability — practice questions with answers
Free practice for Class 9 Mathematics, Chapter 7: The Mathematics of Maybe: Introduction to Probability. Try the solved questions below, then take a free test with instant marking and explanations.
56 questions20 easy, 27 medium, 9 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. What does probability measure?
- How likely an event is to happen
- The length of an event
- How fast an event happens
- The cost of an event
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Answer: A. How likely an event is to happen
Why: It expresses how certain we are that an event will occur. [p.155]
Why: It expresses how certain we are that an event will occur. [p.155]
Q2. Why is tossing a coin called a random experiment?
- We know the possible outcomes but cannot predict which one will occur
- The coin always lands heads
- There is only one outcome
- We can always predict it
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Answer: A. We know the possible outcomes but cannot predict which one will occur
Why: Randomness = known outcomes, unknown result. [p.156]
Why: Randomness = known outcomes, unknown result. [p.156]
Q3. On the probability scale, what is the probability of an impossible event?
- 0
- 1
- 0.5
- −1
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Answer: A. 0
Why: Certain events have probability 1. [p.158, p.173]
Why: Certain events have probability 1. [p.158, p.173]
Q4. What is the set of all possible outcomes of an experiment called?
- The sample space
- An event
- A trial
- The probability scale
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Answer: A. The sample space
Why: e.g. {H, T} for a coin. [p.160]
Why: e.g. {H, T} for a coin. [p.160]
Q5. You roll a die 50 times and get a 4 exactly 8 times. What is the experimental probability of rolling a 4 (as a decimal)?
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Answer: 0.16 (± 0.001)
Why: 8 ÷ 50 = 0.16. [p.160]
Why: 8 ÷ 50 = 0.16. [p.160]
Q6. What is the theoretical probability of rolling a 4 on a fair die?
- 1/6
- 1/4
- 4/6
- 1/2
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Answer: A. 1/6
Why: 1 favourable outcome out of 6. [p.161]
Why: 1 favourable outcome out of 6. [p.161]
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Frequently asked questions
How many practice questions are there for Class 9 Mathematics Chapter 7: The Mathematics of Maybe: Introduction to Probability?
56 questions (20 easy, 27 medium, 9 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 9 Mathematics syllabus, used by CBSE and many state boards.