PROBABILITY

Chapter 7: 7.1 Probability

7.2 Probability of Mutually Exclussive Events

7.3 Probablity of Independent Events


1. Sample space, S = The set of all the possible outcomes

Eg 1 : The possible outcomes when a dice is rolled
Eg 2 : The possible outcomes when a coin is tossed

2. Event = any subset of the sample space

Eg : A = The event of getting even numbers when a dice is rolled

3. The Probability of event A =

n(A) = the number of ways event A can occur
n(S) = the number of possible outcomes

Eg:

A bag contains 3 red marbles, 2 blue marbles and 4 yellow marbles.What is the probability of
picking a blue marble? [2/9]