**Answer
1** :
When we perform an experiment, it is called a trial of the experiment.

**Answer
2** :
An outcome of a trial of an experiment is called an elementary event.

**Answer
3** :
An event association to a random experiment is said to occur in a trial.

**Answer
4** :

In n trials of a random experiment if an event A happens m times, then probability of happening

of A is given by P(A) = m/n

**Answer
5** :

No. of white balls = 4

Let number of red balls = x

Then total number of balls (n) = 4 white + x red = (4 + x) balls

**Answer
6** :

Total number of a die is thrown = 100

Let an even number comes x times, then probability of an even number = x/100

Three coins are tossed simultaneously 200 times with the following frequencies of different outcomes

Find the probability of getting at most two heads.

**Answer
7** :

Total number of three coins are tossed (n) = 200

Getting at the most 2 heads (m) = 72 + 77 + 28 = 177

Probability P(A) = m/n = 177/200

**Answer
8** :

Total number of possible events = 200

No. of events getting at the least = 2 heads (m) = 23 + 72 = 95

Probability P(A) = m/n = 95/200 = 19/40

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