Question

Assume that when adults with smartphones are randomly​ selected, 43​% use them in meetings or classes. If 8 adult smartphone users are randomly​ selected, find the probability that exactly 6 of them use their smartphones in meetings or classes.

Answer 1

n=8, x=6 , p=43% = 0.43  

this is the binomial probability distribution problem

formula to calculate binomial probability is

P(x) = _nC_x * P^x  * (1-P)^n-x

P(6) = ₈C₆ * (0.43)^{6 *}  (1-0.43)^8-6

P(6)= 0.05750670394

P(6) = 0.0575

thus the probability that exactly 6 of them use their smartphones in meetings or classes is = 0.0575