Probability - survey

Question

Jul 24, 2008, 07:35 PM

bendeli

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Join Date: Jul 2008

Posts: 1

Probability - survey

In a large survey, it was discovered that 1 out of every 5 adults visits Disney World every year. If 30 adults are randomly selected what is the probability that exactly 7 of them will visit Disney World this year?

The answer is .154. I do not understand how answer was gotten.

Answers

Jul 25, 2008, 03:29 AM	#2

galactus Mathematics Expert Join Date: Sep 2006 Location: Chaneysville, Pa. Posts: 951	It is a binomial probability. It was gotten like so: $C(30,7)(.20)^{7}(.80)^{23}=.1538...$ Where C(30,7) is the number of ways to choose 7 items from 30

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