Page 82 - Mathematics Class - X

Viva-Voce

1. What is probability?
Ans. The chances of happening or occurrence of an event.
2. Define a sample space of an experiment.

Ans. It is the set of all possible outcomes of a random experiment.
3. What are favourable outcomes of an event?
Ans. The outcomes which ensure the occurrence of an event are called favourable outcomes to that event.

4. What is the probability of a sure event?
Ans. The probability of a sure event is 1.

5. What is the probability of an impossible event?
Ans. The probability of an impossible event is 0.
6. What is the range of the probability?

Ans. 0 < P(E) < 1
7. Can the probability of an event be negative?

Ans. Can not be negative
8. A coin is thrown once. What is the probability of obtaining one head?
1
Ans. P (E) =
2
9. What are the total number of outcomes in rolling two dice?
Ans. 6 × 6 = 36

MCQs

1. Which of the following can be the probability of an event?
a) – 0.04 b) 1.004 c) 18/23 d) 8/7

2. A card is selected at random from a well shuffled deck of 52 playing cards. The probability of its being a
face card is
a) 3/13 b) 4/13 c) 6/13 d) 9/13

3. A bag contains 3 red balls, 5 white balls and 7 black balls. What is the probability that a ball drawn from the
bag at random will be neither red nor black?

a) 1/5 b) 7/15 c) 1/3 d) 8/15
4. If an event cannot occur, then its probability is
a) 1 b) 1/2 c) 0 d) 1/3

Answers: 1. c) 18/23 2. a) 3/13 3. c) 1/3 4. c) 0

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