Cell Phone & Smartphone Ownership, part 2. Exercise 47 shows the results of a survey that asked

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Cell Phone & Smartphone Ownership, part 2.

Exercise 47 shows the results of a survey that asked about cell phone and smartphone ownership in South Africa. Suppose that we select three adults at random from this sample.

a) What is the probability that all three own a smartphone?

b) What is the probability that none of them own a smartphone?

c) What assumption did you make in computing these probabilities?

d) Explain why you think that assumption is reasonable.

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