The Department of Mathematics Education. EMAT 6700
J. Wilson
Finding Probabilities of Compound
Events
Some events are expressed as the outcomes
that are (a)complement event, or (b) disjoint events, or (c) intersection
and union of events. We'll next see how to calculate probabilities
for these three cases.
Complement of an Event
The complement of an event
A consists of all outcomes in the sample space that are not in
A. Ii is denoted as 
. The probability
of 
relates to the probability of
A by:
Disjoint Events
The two events, A and B, are disjoint
if they do not have any common outcomes.
The Intersection and Union of
Two Events.
The intersection of A
and B consists of outcomes that are in both A and B.
The union of A
and B consists of outcomes in A or B. We use "A or B"
to denote that either A occurs, or B occurs, or both occur.
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