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Probability is the chance that something will happen; there are two kinds of probability, theoretical and experimental.

Experimental probability = numberofeventoccurences / (Total number of trials)

Theoretical probability = (Number of favourable outcomes) / (Total number of outcomes)

Example 1: Which of the following is an experiment?

- Tossing a coin
- Rolling a single 6 sided die
- Choosing a ball from a jar
- All of the above

Answer: d

Example 2: A number from 1 to 13 is chosen at random. What is the probability that the selected number is a prime number?

Answer: Prime numbers from 1 to 13 are 2, 3, 5, 7, 11, 13.

Number of prime numbers = 6

Probability of selecting a prime number = ^{6}⁄_{13}

Example 3: What is the probability of drawing a red colored ace from a set of cards ?

Answer:

Total number of cards in a set = 52

Total number of red colored cards = 13 x 2 = 26

Number of ace’s in red colored cards = 2

probability of drawing an ace from a red colored card =^{ 2}⁄_{26} = ^{1}⁄_{13}