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# The probability that a visitor at the mall buys a pack of

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Intern
Joined: 24 Sep 2008
Posts: 20
Followers: 0

Kudos [?]: 18 [0], given: 1

The probability that a visitor at the mall buys a pack of [#permalink]

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11 Oct 2008, 13:36
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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?

* 0.343
* 0.147
* 0.189
* 0.063
* 0.027

Can someone explain answer for this question and what approach i should follow?
Senior Manager
Joined: 21 Apr 2008
Posts: 269
Location: Motortown
Followers: 2

Kudos [?]: 150 [0], given: 0

Re: m04 - 9 - probablity and [#permalink]

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11 Oct 2008, 14:16
•P(Buy) = 3/10, P(No Buy) = 7/10
•2 Yes, 1 No = 3/10*3/10*7/10 = 63/1000
•3 Possibilities = YYN + YNY + NYY = 3(63/1000) = 189/1000 = .189%

Already discussed in this thread 7-t55689
Re: m04 - 9 - probablity and   [#permalink] 11 Oct 2008, 14:16
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# The probability that a visitor at the mall buys a pack of

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