SOLUTION: Assume that when adults with smartphones are randomly selected , 44% use them in meetings or classes. If 5 adult smartphone users are randomly selected , find the probability that

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Question 1183597: Assume that when adults with smartphones are randomly selected , 44% use them in meetings or classes. If 5 adult smartphone users are randomly selected , find the probability that exactly 2 of them use their smartphones in meetings or classes
Answer by greenestamps(13203) About Me  (Show Source):
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Straightforward binomial probability....

The probability that each person uses his phone in meetings or classes is 0.44, so the probability that he does not is 1-0.44 = 0.56.

The probability that in any particular group of 5 people 2 of them use their phones in meetings or classes (and 3 do not) is then %280.44%5E2%29%2A%280.56%5E3%29

Finally, the number of ways of choosing 2 of the 5 people to be the ones that use their phones in meetings or classes is C(5,2).

So the probability that 2 out of 5 chosen people use their phones in meetings or classes is

C%285%2C2%29%2A%280.44%5E2%29%2A%280.56%5E3%29

Use a calculator....