SOLUTION: In the last presidential election 39% of the registerd voters in a certain city actually cast ballots. a)In a random sample of 20 voters from that city, what is the probability th

SOLUTION: In the last presidential election 39% of the registerd voters in a certain city actually cast ballots. a)In a random sample of 20 voters from that city, what is the probability th

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Question 374880: In the last presidential election 39% of the registerd voters in a certain city actually cast ballots.
a)In a random sample of 20 voters from that city, what is the probability that exactly 8 voted in the last presidential election?

Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Let x=.39 and y=.61
(x+y)^20
nCr=Combination=n!/((n-r)!r!
.
20C8=125970
125970*x^8*y^12=0.179 the probability that exactly 8 voted.
.
Ed
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