SOLUTION: Assume that when adults with smartphones are randomly​ selected, 41​% use them in meetings or classes. If 30 adult smartphone users are randomly​ selected, find t
Algebra ->
Probability-and-statistics
-> SOLUTION: Assume that when adults with smartphones are randomly​ selected, 41​% use them in meetings or classes. If 30 adult smartphone users are randomly​ selected, find t
Log On
Question 1104096: Assume that when adults with smartphones are randomly selected, 41% use them in meetings or classes. If 30 adult smartphone users are randomly selected, find the probability that exactly 21 of them use their smartphones in meetings or classes.
You can put this solution on YOUR website! We use the binomial probability distribution to solve this problem
:
Probability (P) ( k successes in n trials) = nCk * p^k * (1-p)^(n-k), where nCk = n! / (k! * (n-k)!)
:
For this problem n = 30, k = 21, p = 0.41
:
P ( 21 use their smart phones out of 30 users ) = 30C21 * (0.41)^21 * (1 - 0.41)^(30-21)
:
***************************************************************
P ( 21 use their smart phones out of 30 users ) = 0.0009
***************************************************************
:
