Probability CBSE Questions & Answers

Probability

This is Mathematics Class 09 Probability CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
If the probability of an event is p, the probability of its complementary event will be:
  • A
    \(1 - {1 \over p}\)
  • B
    1 – \({\rm{p}}\)
    Correct
  • C
    \({\rm{p}}\) – 1
  • D
    \({\rm{p}}\)
2
A card is selected at random from a deck of 52 cards. The probability of its being a red face card is
  • A
    \({1 \over {2}}\)
  • B
    \({2 \over {13}}\)
  • C
    \({3 \over {13}}\)
  • D
    \({3 \over {26}}\)
    Correct
3
A pair of coins is tossed simultaneously. Then the probability of getting exactly one head is:
  • A
    1
  • B
    \({1 \over 4}\)
  • C
    \({3 \over 4}\)
  • D
    \({1 \over 2}\)
    Correct
4
If probability of happening of an event is\({3 \over 7}\), then the probability of non-happening of this event is:
  • A
    0
  • B
    1
  • C
    \({2 \over 7}\)
  • D
    \({3 \over 7}\)
    Correct
5
A die is thrown once , then the probability of getting a prime number is
  • A
    \({1 \over 3}\)
  • B
    \({1 \over 2}\)
    Correct
  • C
    \({2 \over 3}\)
  • D
    0
6
In a single throw of a pair of dice, the probability of getting the sum as a perfect square is :
  • A
    \({11 \over 36}\)
  • B
    \({8 \over 36}\)
  • C
    \({7 \over 36}\)
    Correct
  • D
    \({5 \over 36}\)
7
A number x is chosen at random from - 5, - 4, - 3, - 2, - 1, 0, 1, 2, 3, 4, 5. The probability that | x| \( \le \)4 is :
  • A
    \({7 \over {11}}\)
  • B
    \({9 \over {11}}\)
    Correct
  • C
    \({6 \over {11}}\)
  • D
    \({3 \over {11}}\)
8
A die is thrown once. The probability of getting a number less than 3 is:
  • A
    \({2 \over {3}}\)
  • B
    \({1 \over {3}}\)
    Correct
  • C
    0
  • D
    1
9
A die is thrown once. The probability of getting a number divisible by 2 is:
  • A
    \({1 \over 2}\)
    Correct
  • B
    \({2 \over 3}\)
  • C
    1
  • D
    0
10
Which of the following cannot be the probability of an event ?
  • A
    \({1 \over 3}\)
  • B
    \({1 \over 16}\)
    Correct
  • C
    3\(\% \)
  • D
    0.1
11
A card is drawn from 52 cards then probability of getting Black ace is:-
  • A
    \({3 \over 52}\)
  • B
    \({1 \over 52}\)
  • C
    \({2 \over 52}\)
    Correct
  • D
    \({4 \over 52}\)
12
A coin is tossed 3 times then probability of getting atleast two tails is:-
  • A
    \({1 \over 8}\)
  • B
    \({4 \over 8}\)
    Correct
  • C
    \({3 \over 8}\)
  • D
    \({2 \over 8}\)
13
Three coins are tossed together then probability of getting atmost one head is:-
  • A
    \({1 \over 2}\)
    Correct
  • B
    1
  • C
    \({1 \over 8}\)
  • D
    \({1 \over 4}\)
14
A bag contains 4 green, 5 black and 10 red balls then probability of getting that one drawn ball is not green is
  • A
    \({5 \over 19}\)
  • B
    \({4 \over 19}\)
  • C
    \({10 \over 19}\)
  • D
    \({15 \over 19}\)
    Correct
15
Probability that a leap year, selected at random will contain 53 Saturdays is: -
  • A
    \({53 \over 365}\)
  • B
    \({1 \over 7}\)
  • C
    \({2 \over 7}\)
    Correct
  • D
    \({7 \over 365}\)