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person selected will have brown eyes?

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person selected will have brown eyes?

by sanju09 » Fri Sep 16, 2011 12:24 am
In a group of 10 people, 60 percent have brown eyes. Two people are to be selected at random from the group. What is the probability that neither person selected will have brown eyes?
(A) 0.13
(B) 0.16
(C) 0.25
(D) 0.36
(E) 0.64



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by pemdas » Fri Sep 16, 2011 1:01 am
6 people have brown eyes, and 4 people don't have brown eyes.
the first person selected with no brown eyes is 4/10
the second person selected with no brown eyes is 3/9
total probabilities= 4/10 * 3/9 = 2/5 * 1/3 = 2/15 or 13.33%

a
sanju09 wrote:In a group of 10 people, 60 percent have brown eyes. Two people are to be selected at random from the group. What is the probability that neither person selected will have brown eyes?
(A) 0.13
(B) 0.16
(C) 0.25
(D) 0.36
(E) 0.64



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