SOLUTION: Assume that when adults with smartphones are randomly selected, 43% use them in meetings or classes. If 10 adult smartphone users are randomly selected, find the probabili
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Question 1152815: Assume that when adults with smartphones are randomly selected, 43% use them in meetings or classes. If 10 adult smartphone users are randomly selected, find the probability that fewer than 3 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 test
fewer than 3 means 0,1,2
probability 0 use them is 0.57^10 (probability that none use them out of 10)
and that is 0.0036
probability that 1 uses them is 10 (ways it can occur)*0.43*0.57^9=0.0273
probability that 2 use them is 45*0.45^2*0.57^8=0.0927
the answer is the sum of those 3 or 0.1236
