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) (Show Source): You can put this solution on YOUR website!
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
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
Use a calculator....
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