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Topic: Statistics puzzle: probability of belonging to a group
Replies: 1   Last Post: Oct 11, 2007 5:50 PM

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BigFurryMonster

Posts: 1
From: Netherlands
Registered: 10/11/07
Statistics puzzle: probability of belonging to a group
Posted: Oct 11, 2007 10:24 AM
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I'm struggling with the following puzzle:

I have a group of friends of which 60% is male.
I have a group of colleagues of which 70% is male.


Someone I know is both a friend and a colleague.

What is the chance that this person is male?


a) < 60 %
b) 60 %
c) between 60 en 70%
d) 70%
e) > 70%

(and why?)

Thanks for your help!
- BigFurryMonster



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