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Among a group of 2500 people, 35% invest in municipal bonds,

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Among a group of 2500 people, 35% invest in municipal bonds, [#permalink] New post 08 Nov 2008, 07:46
Among a group of 2500 people, 35% invest in municipal bonds, 18% invest in oil stocks and 7% invest in both oil and municipal bonds. If 1 person is randomly selected from the 2500 people, what is the probability that the person selected will be one who invests in municipal bonds but NOT oil stocks?

A 9/50
B 7/25
C 7/20
D 21/50
E 27/50
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Re: probability q [#permalink] New post 08 Nov 2008, 09:07
MB= 875

OS = 450

MB n OS = 175

MB n !OS = 700

Reqd Probability = 700/2500 = 7/25.

B
Re: probability q   [#permalink] 08 Nov 2008, 09:07
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Among a group of 2500 people, 35% invest in municipal bonds,

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