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Probability Involving AND and OR

by Derivator
Tags: involving, probability
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Derivator
#1
May22-12, 02:24 AM
P: 144
Hi folks,

1. The problem statement, all variables and given/known data
At Roanoke College it is known that 1/3
of the students live off campus. It is also known that 5/9
of the students are from within the state of Virginia and that 3/4
of the students are from out of state or live on campus. What is the
probability that a student selected at random from Roanoke College is from out
of state and lives on campus?


2. Relevant equations

-

3. The attempt at a solution

It should yield:
P(out off state OR lives on campus) = P(out off state) + P(lives on campus) - P(out off state AND lives on campus)
thus
P(out off state AND lives on campus)
= P(out off state)+P(lives on campus)-P(out off state OR lives on campus)
=(1-5/9)+(1-1/3)-(3/4)
=4/9 + 2/3 - 3/4
=13/36
Is this correct?

-derivator
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RoshanBBQ
#2
May22-12, 03:18 AM
P: 280
Yes.
Derivator
#3
May23-12, 04:25 AM
P: 144
thanks

HallsofIvy
#4
May23-12, 06:49 AM
Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 39,310
Probability Involving AND and OR

The phrase should be "out of state", not "out off state".


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