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Example:
The governor has narrowed his choices for a new agency director to five
finalists:
Jimmy Page
Democrat
Eric Clapton
Republican
Richie Blackmore
Republican
Nancy Wilson
Republican
Ted Nugent
Republican
The governor has no preference for one over the other; in other words, each has an
equally likely chance of being chosen.
Find the probability that:
a) Jimmy Page is chosen
b) Nancy Wilson is chosen
c) Jimmy Page or Nancy Wilson is chosen
d) a female is chosen
e) a Republican is chosen
f) a female Republican is chosen
g) a Democrat or Republican is chosen
h) an independent is chosen
Solution:
a) 1/5
b) 1/5
c) 2/5
d) 2/5
e) 4/5
f) 1/5 (Nancy Wilson is the only female Republican)
g) 5/5 = 1 (All five are either Democrats
or
Republicans)
h) 0/5 = 0 (None of the five are independents)
Some observations:
1) The probability of an event is always a number between 0 and 1.
2) The probability of an impossible event is 0.
3) The probability of a certain event is 1.
Highly unlikely to
occur
Very likely to occur
0
1
Example:
Past records show that the probability that a senator votes to confirm a
nominee to the federal judiciary is .88.
What is the probability that the senator votes to
reject a nominee to the federal judiciary?
Solution:
1 .88 = .12
Example:
The probability that an FIU student voted for the incumbent for Student
Government President is .09 and the probability that he or she voted for the lone
challenger was .06.
What is the probability that an FIU student didn’t vote at all in the
election?
Solution:
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This note was uploaded on 04/29/2008 for the course MGF 1107 taught by Professor Storfer during the Spring '08 term at FIU.
 Spring '08
 Storfer

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