Term 3 Probability Book Back Questions

9th Standard

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Maths

Time : 00:45:00 Hrs
Total Marks : 30
    7 x 1 = 7
  1. A number between 0 and 1 that is used to measure uncertainty is called

    (a)

    Random variable

    (b)

    Trial

    (c)

    Simple event

    (d)

    Probability

  2. A random experiment contains

    (a)

    Atleast one outcome

    (b)

    At least two outcomes

    (c)

    Atmost one outcome

    (d)

    Atmost two outcomes

  3. The probability of all possible outcomes of a random experiment is always equal to

    (a)

    One

    (b)

    Zero

    (c)

    Infinity

    (d)

    All of the above

  4. If A is any event in S then its complement P(A′) is equal to

    (a)

    1

    (b)

    0

    (c)

    1-A

    (d)

    1-P(A)

  5. Which of the following cannot be taken as probability of an event?

    (a)

    0

    (b)

    0.5

    (c)

    1

    (d)

    -1

  6. A collection of one or more outcomes of an experiment is called

    (a)

    Event

    (b)

    Outcome

    (c)

    Sample point

    (d)

    None of the above

  7. A letter is chosen at random from the word “STATISTICS”. The probability of getting a vowel is

    (a)

    \(\frac { 1 }{ 10 } \)

    (b)

    \(\frac { 2 }{ 10 } \)

    (c)

    \(\frac { 3 }{ 10 } \)

    (d)

    \(\frac { 4 }{ 10 } \)

  8. 7 x 2 = 14
  9. You are walking along a street. If you just choose a stranger crossing you, what is the probability that his next birthday will fall on a sunday?

  10. What is the probability of drawing a King or a Queen or a Jack from a deck of cards?

  11. When two coins are tossed, what is the probability that two heads are obtained?

  12. A manufacturer tested 7000 LED lights at random and found that 25 of them were defective. If a LED light is selected at random, what is the probability that the selected LED light is a defective one.

  13. In a football match, a goalkeeper of a team can stop the goal, 32 times out of 40 attempts tried by a team. Find the probability that the opponent team can convert the attempt into a goal.

  14. A company manufactures 10000 Laptops in 6 months. In that 25 of them are found to be defective. When you choose one Laptop from the manufactured, what is the probability that selected Laptop is a good one.

  15. If a probability of a player winning a particular tennis match is 0.72. What is the probability of the player loosing the match?

  16. 3 x 3 = 9
  17. When a dice is rolled, find the probability to get the number greater than 4?

  18. In an office, where 42 staff members work, 7 staff members use cars, 20 staff members use two-wheelers and the remaining 15 staff members use cycles. Find the relative frequencies.

  19. The probability that it will rain tomorrow is \(\\ \frac { 91 }{ 100 } \). What is the probability that it will not rain tomorrow?

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