Simple Probability

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Probability is the measure of occurrence of an event.
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.
Odds of an event = No. of ways theevent occurs : No. of ways the event can’t occur
= 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 = 36
= 12 = 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 =620 =310 = 0.3

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