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Three in four teenagers are mobile Internet users - that is, they mostly go online using their phone
and not using some other device such as a desktop or laptop computer. If a sample of 10 Hong
Kong teens is selected, a) what is the probability that 4 are mobile Internet users? (7 marks) b)
what is the probability that at least 2 are mobile Internet users? ( 8 marks) c) Discuss whether the
four properties of binomial distribution hold in Question 1. (10 marks)

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