PROBABILITY

1. 1.The difference between experimental probability and theoretical probability.

2. 6. An event having only one outcome is called an elementary event. The sum of the probabilities of all the elementary events of an experiment is 1.

3. 7. For any event E, P (E) + P ( E ) = 1, where E stands for ‘not E’. E and E are called complementary events.

4. 2. The theoretical (classical) probability of an event E, written as P(E), is defined as P (E) = Number of outcomes favourable to E/ Number of all possible outcomes of the experiment. where we assume that the outcomes of the experiment are equally likely

5. 3. The probability of a sure event (or certain event) is 1.

6. 4. The probability of an impossible event is 0.

7. 5. The probability of an event E is a number P(E) such that 0 ≤ P (E) ≤ 1