CDA6530: Performance Models of Computers and Networks
Chapter 1: Review of Practical
Chapter 1:
Review of Practical
Probability

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Probability Definition
Sample Space (S) which is a collection of
Sample Space (S) which is a collection of
objects (all possible scenarios or values).
Each object is a sample point.
Set of all persons in a room
{1,2,…,6} sides of a dice
{0,1} for shooter results
(0,1) real number
A
t E i
t
f
l
i t
An event E is a set of sample points
Event E
⊆
S
2

Probability Definition
Probability P defined on events:
0
≤
P(E)
≤
1
If E=
P(E)=0;
If E=S
P(E)=1
If events A and B are mutually exclusive,
P(A
B) = P(A) + P(B)
3

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