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i Preview File Edit View Go Tools Window Help *12% D Wed 12:52 AM Q ma2720homework2f18.pdf (page 5 of 5) Q Search Screen Shot 2018-09...4.57 AM Screen Shot 2018-09...5.19 AM 8. Video sharing sites, led by YouTube, are popular destinations on the Internet. About 27% of adult Internet users are 18 to 29 years old, another 45% are 30 to 49 years old and the remaining 28% are 50 and over. The Pew Internet and American Life Project finds that 70% of Internet users aged 18 to 29 have visited a video sharing site, along with 51% of those aged 30 to 49 and 2% of those 50 or older. Screen Shot 2018-09...5.22 AM a. What percent of adult Internet users visit video sharing sites? Screen Shot 2018-09...8.04 AM b. What percent of adult Internet users who visit video sharing sites are aged 18 to 29? 6 AA (A

Explanation / Answer

Ans:

Given that

P(18-29)=0.27

P(30-49)=0.45

P(50 and over)=0.28

P(visit/18-29)=0.70

P(visit/30-49)=0.51

P(visit/50 and over)=0.02

a)

P(visit)=0.27*0.70+0.45*0.51+0.28*0.02=0.4241

b)

P(18-29/visit)=P(visit/18-29)*P(18-29)/P(visit)

=0.70*0.27/0.4241

=0.4456

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