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Probability

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Random Experiments, Outcomes and Sample Spaces

Subtopic

Random Experiments, Outcomes and Sample Spaces under Probability for Grade 11 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A die is thrown. What is the sample space SS for the event 'getting a number less than 1'?

    A.

    {0}\{0\}

    B.

    {1}\{1\}

    C.

    {}\{\}

    D.

    {−1}\{-1\}

  2. 2.

    In a family with 3 children, what is the sample space for the number of girls?

    A.

    {1,2,3}\{1, 2, 3\}

    B.

    {0,1,2,3}\{0, 1, 2, 3\}

    C.

    {GGG,GGB,GBB,BBB}\{GGG, GGB, GBB, BBB\}

    D.

    {B,G}\{B, G\}

  3. 3.

    A spinner has 4 colors: Red, Blue, Green, Yellow. If it is spun once, what is the size of the sample space?

    A.

    2

    B.

    4

    C.

    1

    D.

    8

Download the worksheet for Probability - Random Experiments, Outcomes and Sample Spaces to practice offline. It includes additional chapter-level practice questions.

Event

Subtopic

Event under Probability for Grade 11 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If P(A)=14P(A) = \frac{1}{4}, what is P(A′)P(A')?

    A.

    14\frac{1}{4}

    B.

    12\frac{1}{2}

    C.

    34\frac{3}{4}

    D.

    0

  2. 2.

    If two coins are tossed, what is the probability of getting at most one tail?

    A.

    14\frac{1}{4}

    B.

    12\frac{1}{2}

    C.

    34\frac{3}{4}

    D.

    1

  3. 3.

    A die is thrown once. What is the probability of getting a number greater than or equal to 2?

    A.

    16\frac{1}{6}

    B.

    13\frac{1}{3}

    C.

    23\frac{2}{3}

    D.

    56\frac{5}{6}

Download the worksheet for Probability - Event to practice offline. It includes additional chapter-level practice questions.

Axiomatic Approach to Probability

Subtopic

Axiomatic Approach to Probability under Probability for Grade 11 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If P(A∪B)=0.8P(A \cup B) = 0.8, P(A)=0.5P(A) = 0.5, P(B)=0.6P(B) = 0.6, then P(A∩B)P(A \cap B) is:

    A.

    0.1

    B.

    0.2

    C.

    0.3

    D.

    0.4

  2. 2.

    The probability of getting a tail in a single toss of a coin is:

    A.

    00

    B.

    0.50.5

    C.

    11

    D.

    22

  3. 3.

    If P(A)=0.4P(A) = 0.4, P(B)=0.5P(B) = 0.5, and P(A∪B)=0.9P(A \cup B) = 0.9, then the event A∩BA \cap B is:

    A.

    The whole sample space

    B.

    An impossible event

    C.

    A sure event

    D.

    None of these

Download the worksheet for Probability - Axiomatic Approach to Probability to practice offline. It includes additional chapter-level practice questions.

Probability of an event

Subtopic

Probability of an event under Probability for Grade 11 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A coin is tossed three times. What is the probability of getting no tails?

    A.

    18\frac{1}{8}

    B.

    14\frac{1}{4}

    C.

    12\frac{1}{2}

    D.

    78\frac{7}{8}

  2. 2.

    A number is chosen from {1,2,...,30}\{1, 2, ..., 30\}. What is the probability that it is a perfect square?

    A.

    15\frac{1}{5}

    B.

    16\frac{1}{6}

    C.

    110\frac{1}{10}

    D.

    115\frac{1}{15}

  3. 3.

    A card is drawn from a well-shuffled deck of 52 cards. What is the probability of getting a club or an ace?

    A.

    413\frac{4}{13}

    B.

    1752\frac{17}{52}

    C.

    14\frac{1}{4}

    D.

    313\frac{3}{13}

Download the worksheet for Probability - Probability of an event to practice offline. It includes additional chapter-level practice questions.