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In a survey of 248 people, 156 are married, 70 are

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Intern
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Joined: 25 Aug 2008
Posts: 30
In a survey of 248 people, 156 are married, 70 are [#permalink]

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New post 18 Oct 2008, 21:08
In a survey of 248 people, 156 are married, 70 are self-employed, and 25 percent of those who are married are self-employed. If a person is to be randomly selected from those surveyed, what is the probability that the person selected will be self-employed but not married?
a. 1/8
b. 4/31
c. 117/248
d. ¼
e. 31/117

Thanks.

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Re: GMAT QUESTION HELP [#permalink]

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New post 18 Oct 2008, 22:36
1
Poots wrote:
In a survey of 248 people, 156 are married, 70 are self-employed, and 25 percent of those who are married are self-employed. If a person is to be randomly selected from those surveyed, what is the probability that the person selected will be self-employed but not married?
a. 1/8
b. 4/31
c. 117/248
d. ¼
e. 31/117

Thanks.

we see that clearly ,1/4*156 =39 people are both maried and self-emp.
hence 70-39=31 are those who are self-emp and not married

also total of 248 people exit ,one needs to be picked from the same

hence prob that self-emp not married = 31/248=1/8
IMO A
OA plsss
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Joined: 25 Aug 2008
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Re: GMAT QUESTION HELP [#permalink]

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New post 19 Oct 2008, 16:45
You know, I kept getting 31/248 but I didn't simplify correctly. Silly mistake. I really have to watch out for that.

Thanks

Kudos to you!

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Re: GMAT QUESTION HELP   [#permalink] 19 Oct 2008, 16:45
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