What kinds of Web sites do males aged 18 to 34 visit most often? Half of male Internet users in this age group visitan auction site such as eBay at least once a month. A study of Internet use interviews a random sample of 450 men aged 18 to 34 Let X the number in the sample who visit an auction site at least once a month. a) Show that X is approximately a binomial random variable b) Check the conditions for using a Normal approximation in this setting e) Use the Normal approximation to find the probability that at least 235 of the men in the sample visit an online auction site at least once a month.

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