Page 85 - Mathematics Class - X

4. Experimental probability of a head is nearly equal to theoretical _______ .

5. _______ probability of a head is _____ to theoretical ________ .

INFERENCE
Experiment probability of a head is nearly equal to theoretical probability.

EXTENDED TASK
1. Two dice are thrown at the same time. Find the probability of getting

(i) same number on both dice. (ii) different numbers on both dice.
2. Determine the probability of getting two heads by tossing two coins simultaneously 1000 times and compare
it with its theoretical probability.

APPLICATION
Probability is used extensively in fields like physical sciences, commerce, biological sciences, medical sciences,
weather forecasting, etc.

Viva-Voce

1. What do you mean by an event?
Ans. The set representing the desired outcome of a random experiment is called an event.

2. What is the sum of the probabilities of all the outcomes (elementary events) of an experiment?
Ans. One
3. Define equally likely events.

Ans. The results of a random experiment are said to be equally likely, if the different outcomes have the same or
equal chances of occurrence.
4. What is the probability of a head while tossing a coin?
1
Ans. .
2

5. What are independent events?
Ans. Two or more events are said to be independent, if the happening (non-happening) of one event is not
affected by the happening or non-happening of others.
6. A die is thrown once. What is the probability of getting an even number?

Ans. 3 = 1
6 2
7. A die is thrown once. What is the probability of getting a prime number?

Ans. 3 = 1
6 2
8. A coin is tossed two times. How many possible outcomes are there?

Ans. Possible outcomes are (H, H), (H, T), (T, H), (T, T)

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