Aryan Y.

asked • 04/14/20

statistics help

Assume that when adults with smartphones are randomly​ selected, 49​% use them in meetings or classes. If 7 adult smartphone users are randomly​ selected, find the probability that at least 5 of them use their smartphones in meetings or classes.

1 Expert Answer

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Whiz S. answered • 04/14/20

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We can use the binomial formula to solve this probability question. The probability for the first outcome, that is smartphone use, is given as 0.49. Therefore, the other probability would become

Pno−smartphone=1−0.49=0.51

We can calculate the probability as shown below.

P(exactly 5 smart phone)=7C5 × 0.495 × 0.517-5 

= 21 × 0.028× 0.2601

=0.1530

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