SOLUTION: Assume that when adults with smartphones are randomly selected, 41% use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probability that ex

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Question 1199946: Assume that when adults with smartphones are randomly selected, 41% use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probability that exactly 2 of them use their smartphones in meetings or classes.
The probability is
Answer by ikleyn(52884) About Me  (Show Source):
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Assume that when adults with smartphones are randomly selected,
41% use them in meetings or classes. If 7 adult smartphone users are randomly selected,
find the probability that exactly 2 of them use their smartphones in meetings or classes.
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It is a binomial type probability distribution problem.


The number of trial n= 7; the probability of the success trial is  0.41,  and the number of success trials k = 2. 


    P = C%5B7%5D%5E2%2A0.41%5E2%2A%281-0.41%29%5E%287-2%29 = %28%287%2A6%29%2F%281%2A2%29%29%2A0.41%5E2%2A0.59%5E5 = 0.2524 = 25.24% (rounded).     ANSWER

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To see many other similar solved problems, look into the lessons
    - Simple and simplest probability problems on Binomial distribution
    - Typical binomial distribution probability problems
in this site.