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Assume that when adults with smartphones are randomly​ selected, 39​% use them in meetings or classes. If 9 adult smartphone users are randomly​ selected, find the probability that exactly 7 of them use their smartphones in meetings or classes

 Feb 16, 2020
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Probability of being used is 0.39.

Probability of not being used is 0.61.

You want exactly 7 of 9.

 

9C7 · 0.397 · 0.612         =         your answer

 Feb 16, 2020

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