Conditional Probability and Independence
Conditional Probability and Independence
Christopher Croke
University of Pennsylvania
Math 115
Christopher Croke
Calculus 115
Probability
The probability of an event depends on the sample space.
Christopher Croke
Calculus 115
Probability
The probability of an event depends on the sample space. Problem: In a group of 30 athletes 12 are women, 18 are swimmers, and 10 are neither. A person is chosen at random.
Christopher Croke
Calculus 115
Probability
The probability of an event depends on the sample space. Problem: In a group of 30 athletes 12 are women, 18 are swimmers, and 10 are neither. A person is chosen at random. What is the probability that it is a female swimmer?
Christopher Croke
Calculus 115
Probability
The probability of an event depends on the sample space. Problem: In a group of 30 athletes 12 are women, 18 are swimmers, and 10 are neither. A person is chosen at random. What is the probability that it is a female swimmer? Here we find (from inclusion/exclusion) that #(S W ) = 10 so
#(S W ) 10 1
Pr (S W ) =
= =.
total# 30 3
Christopher Croke
Calculus 115
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