# Assume that when adults with smartphones are randomly​

Assume that when adults with smartphones are randomly​ selected,

54​%

use them in meetings or classes. If

5

adult smartphone users are randomly​ selected, find the probability that exactly

3

of them use their smartphones in meetings or classes.

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star233

$P\left(\mathrm{Smartphones}\right)=0.54$

$n=5$

$=10{\left(0.54\right)}^{3}{\left(0.46\right)}^{2}$

=$10×0.1575×0.2116$

$=0.3333$