Hi

about 50% of male Internet users in this age group visit an auction site such

 as eBay at leat once a month. 

random sample of 12 male Internet users aged 18-34.

Find the probability that at least 8 of the 12 have visited an auction site in the past month!

 P(at least 8 of 12) = P(8 ≤ x ≤ 12) = .1938



Note: The probability of x successes in n trials is: 

P = nCx*  where p and q are the probabilities of success and failure respectively. 

In this case p & q are = .5

nCx = 

 

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