Unformatted text preview: bability Motivating Example Notes In a certain population, the probability a person lives to
be 80 is 80% while the probability a person lives to be 90
is 68%. Given that a person lives to be 80, what is the
probability that she/he will live to be 90?
Conditional
Probability Solution. General
Multiplication Rule Event A: a person lives to be 90
Event B : a person lives to be 80
P(A∩B )
P(B ) =
P(a person lives to be 80 AND a person lives to be 90)
P(a person lives to be 80)
P(a person lives to be 90)
0.68
P(a person lives to be 80) = 0.80 = 0.85 P(AB ) = =...
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 Spring '08
 MARTIN
 Conditional Probability, Probability

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