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An **event** is one or more outcomes (result) of an experiment.

An experiment is that which have a chance (to be done or not to be) in the result.

= Success : Failure

Gaussian distribution function:

It is also called as “normal distribution”. It is a bell shaped curve.

Example 1:Find the probability of rolling an odd number on the dice. Express the probability as a fraction, decimal, ratio and percent.

Answer: The possible even numbers are 1, 3 and 5.

Number of favourable outcomes = 3

Total number of outcomes = 6

Probability to get an even number =^{ 3}⁄_{6}

= ^{1}⁄_{2} = 0.5 = 1: 2 = 50%

Example 2: There are 5 red marbles, 6 blue marbles and 9 yellow marbles. What is the probability of finding a blue marble?

Answer: Number of blue marbles = 6

Number of favourable outcomes = 6

Total number of blue marbles = 5 + 6 + 9 = 20

Probability to get a blue marble =^{6}⁄_{20} =^{3}⁄_{10} = 0.3