Mobile phones with Internet access. According to a Jupiter/NPD Consumer Survey of young adults (18-24 years of age) who shop online, 20% own a mobile phone with Internet access. (American Demographics, May 2002.) In a random sample of 200 young adults who shop online, let x be the number who own a mobile phone with Internet access.
a. Explain why x is a binomial random variable (to a reasonable degree of approximation).
b. What is the value of p? Interpret this value.
c. What is the expected value of x? Interpret this value.
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