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PS - Probability

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Manager
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Joined: 07 Jan 2008
Posts: 85
PS - Probability [#permalink]

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New post 13 Dec 2008, 18:10
00:00
A
B
C
D
E

Difficulty:

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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?

A# 0.343
B# 0.147
C# 0.189
D# 0.063
E# 0.027

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Manager
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Re: PS - Probability [#permalink]

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New post 13 Dec 2008, 18:37
Shouldn't this be 0.3 * 0.3 * 0.7 = 0.063 i.e. D.
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Re: PS - Probability [#permalink]

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New post 13 Dec 2008, 19:41
topmbaseeker wrote:
Shouldn't this be 0.3 * 0.3 * 0.7 = 0.063 i.e. D.


you consider only one case.. there are 3 cases.

(A+B) buy candies + (B+C) buy candies + (C+A) buy candies
=
0.3*0.3*0.7 + 0.3*0.3*0.7 + 0.3*0.3*0.7
= 0.189
or
= 3C2*0.3*0.3*0.7 =0.189

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: PS - Probability   [#permalink] 13 Dec 2008, 19:41
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