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

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New post 21 Jun 2016, 09:37
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New post 31 Aug 2017, 03:08
Hello from the GMAT Club BumpBot!

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

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New post 02 Sep 2017, 07:21
yuefei wrote:
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. .343
B. .147
C. .189
D. .063
E. .027


We need to determine the probability that two out of three visitors will buy a pack of candy:

P(Y-Y-N) = 0.3 x 0.3 x 0.7 = 0.063

Since there are 3 ways -- (Y-Y-N), (Y-N-Y), or (N-Y-Y) -- in which two of the three visitors can buy a pack of candy, the overall probability is 3 x 0.063 = 0.189.

Answer: C
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Re: The probability that a visitor at the mall buys a pack of   [#permalink] 02 Sep 2017, 07:21

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