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Thirty-five percent of people who own cell phones use their phones to send and receive text message. Choose 4 cell phones owners at random. What is the probabi

Multipulcation Rules and cconditional probability.
 
Thirty-five percent of people who own cell phones use their phones to send and receive text message. Choose 4 cell phones owners at random. What is the probability that none use their phone for texting?
 
The answer is 0.179 how is this problem set up.

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1 Answer

65% don't use their phones to send and receive text message.
The probability that none of the four use their phone for texting is .65^4

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Note that this argument assumes that "choosing cell phone owners at random" are independent events, which is only true if the "35% who text" refers to a large population. For a small population, say 20 cell phone owners, the probability will change with every choice.