SOLUTION: Assume that when adults with smartphones are randomly selected, 55% use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probabili
Algebra.Com
Question 1167372: Assume that when adults with smartphones are randomly selected, 55% use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probability that at least 4 of them use their smartphones in meetings or classes.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
This is a binomial with n=7 p=0.55
a least 4 of them use their smartphones
that is 1-prob(3) of them use them.
=0.6083 is answer.
probability 4 use them is 7C4*0.55^4*0.45^3=0.2918
for 5 it is 0.2140
for 6 it is 0.0872
for 7 it is 0.55^7 or 0.0152
add them to get 0.6082 (rounding error)
RELATED QUESTIONS
Assume that when adults with smartphones are randomly selected, 54% use them in meetings... (answered by Boreal)
Assume that when adults with smartphones are randomly selected , 44% use them in meetings (answered by greenestamps)
Assume that when adults with smartphones are randomly selected, 56% use them in... (answered by ikleyn)
Assume that when adults with smartphones are randomly selected, 57% use them in... (answered by ikleyn)
Assume that when adults with smartphones are randomly selected, 42% use them
in... (answered by AnlytcPhil)
Assume that when adults with smartphones are randomly selected, 42% use them in... (answered by Boreal)
Assume that when adults with smartphones are randomly selected, 46%
use them in... (answered by ikleyn)
Assume that when adults with smartphones are randomly selected, 62% use them in... (answered by jim_thompson5910)
Assume that when adults with smartphones are randomly selected, 43% use them in... (answered by Boreal)