Hots Questions- Probability Class 9 Notes | EduRev

Class 9 Mathematics by Full Circle

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Class 9 : Hots Questions- Probability Class 9 Notes | EduRev

The document Hots Questions- Probability Class 9 Notes | EduRev is a part of the Class 9 Course Class 9 Mathematics by Full Circle.
All you need of Class 9 at this link: Class 9

1. A bag-I contains four cards numbered 1, 3, 5 and 7 respectively. Another bag-II contains three cards numbered 2, 4 and 6 respectively. A card is drawn at random from each bag. Find the probability that the sum of two cards drawn is 9.

 

Hots Questions- Probability Class 9 Notes | EduRev

All outcomes = 12
Favourable outcomes = 3

⇒  Hots Questions- Probability Class 9 Notes | EduRev

 

2. A bag contains 7 white, 3 red and 4 black balls. A ball drawn at random. Find the probability that it is a red or a black ball.

Hint: Total number of possible outcomes = 7 + 3 + 4 = 14. Out of 14 possible outcomes, there are 7 favourable outcomes (3 red and 4 black) i.e. their are 7 balls which are either red or black.
∴ Required probability = P(a red or a black ball) = (7/14)= (1/2)

 

3. In a single throw of two dice, find the probability of getting a total of 8.

Hots Questions- Probability Class 9 Notes | EduRev

∴ Favourable outcomes are : (2, 6), (3, 5), (4, 4), (5, 3), (6, 2) i.e. 5 outcomes are favourable.
∴ Required probability = (5/36)

 

4. One card is drawn from a well-shuffled deck of 52 cards. Find the probability of getting a face card.

Hint: 52 cards are divided into 4 suits of 13 cards each. Kings, queen and jacks are called face-cards.
∴ Total number of face cards = 3 × 4 = 12
∴ Favourable outcomes = 12
⇒ Required probability = (12/52)= (3/13)

 

5. Two unbiased coins are tossed once. What is the probability of getting exactly one head?

Hint: In a throw of two coins, the total number of possible outcomes = 22 = 4 [namely : (H, H), (H, T), (T, H) and (T, T)].
For the event of getting exactly one head (i.e. no tail).
⇒ Favourable outcomes are (H, T) and (T, H) i.e., 2
⇒ Required probability = (2/4)= (1/2)

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