In Exercises 21–24, assume that when adults with smartphones are randomly selected, 54% use them in meetings or classes (based on data from an LG Smartphone survey).If 20 adult smartphone users are randomly selected, find the probability that exactly 15 of them use their smartphones in meetings or classes.

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Asked Dec 30, 2019
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In Exercises 21–24, assume that when adults with smartphones are randomly selected, 54% use them in meetings or classes (based on data from an LG Smartphone survey).

If 20 adult smartphone users are randomly selected, find the probability that exactly 15 of them use their smartphones in meetings or classes.

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Expert Answer

Step 1

Define the random variable x as the number of adults who use their smartphone in meetings or classes. Here, the number of adult smartphone users (n) is 8 and each adult is independent of the other. Also, there are two possible outcomes (adults who use smartphones during meetings or...

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