Question
Asked Jan 20, 2020
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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 12 adult smartphone users are randomly selected, find the probability that fewer than 3 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 smartphones during 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 classes and adults who do not use smartphones during meetings or classes) and the probability of adults who use smartphones during meetings or classes (p) is 0.54. Thus, x follows binomial distribution.

Statistics homework question answer, step 1, image 1
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Step 2

Here “fewer than 3 adults using smartphones” represents that x takes the values ...

Statistics homework question answer, step 2, image 1
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