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CBSE Class 9 Statistics and Probability — practice questions — page 2

Explore 50 free Statistics and Probability questions in CBSE Class 9 Mathematics. Open each question or exercise to read its content, reference answers and available explanation.

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Statistics and Probability questions and exercises with answers

Showing questions 31–50 of 50.

Median of an odd-length sorted data set is:Read the answer and worked solution →Probability of a certain event:Read the answer and worked solution →Probability of rolling a 6 on a fair die:Read the answer and worked solution →For independent events A and B, P(A and B) equals:Read the answer and worked solution →For mutually exclusive events A and B, P(A or B) equals:Read the answer and worked solution →Find mean of {2, 4, 6, 8, 10}:Read the answer and worked solution →Variance of {2, 4, 6, 8, 10}:Read the answer and worked solution →Standard deviation of {2, 4, 6, 8, 10}:Read the answer and worked solution →P(at least one head in 2 fair coin tosses):Read the answer and worked solution →Probability of drawing a heart from a standard 52-card deck:Read the answer and worked solution →Probability measures the likelihood of:Read the answer and worked solution →A probability of 1 means the event is:Read the answer and worked solution →Rolling a standard die has how many possible outcomes?Read the answer and worked solution →A repeatable observation with an unpredictable result is a:Read the answer and worked solution →Theoretical probability is favourable outcomes divided by:Read the answer and worked solution →For any event E, the value of P(E) lies between:Read the answer and worked solution →Match the probability termRead the answer and worked solution →Impossible or certain?Read the answer and worked solution →True or false about probabilityRead the answer and worked solution →Complete the probability scaleRead the answer and worked solution →

Worked practice questions

Median of an odd-length sorted data set is:

  1. First value
  2. Middle value (n+1)/2 th term
  3. Last value
  4. Average of first and last
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Correct answer: B. Middle value (n+1)/2 th term

For odd n, median = middle value at position (n+1)/2. For even n, median = average of n/2 and (n/2 + 1) values.

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Probability of a certain event:

  1. 0
  2. 1
  3. 1/2
  4. Negative
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Correct answer: B. 1

P(certain event) = 1. P(impossible event) = 0. Probabilities lie in [0, 1]. Sum over all mutually exclusive complete outcomes = 1.

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Probability of rolling a 6 on a fair die:

  1. 1/2
  2. 1/3
  3. 1/4
  4. 1/6
Show answer and solution

Correct answer: D. 1/6

P(6) = 1/6 for a fair die. 6 equally likely outcomes, 1 favorable.

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