SOLUTION: Assume that when adult with smartphone are randomly selected, 41% use them in meeting or clases . If 7 adult smartphone users are randomly selected, find the probability that at le
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Question 1167384: Assume that when adult with smartphone are randomly selected, 41% use them in meeting or clases . If 7 adult smartphone users are randomly selected, find the probability that at least 2 of them use their smartphone in meeting or classes Answer by VFBundy(438) (Show Source):
You can put this solution on YOUR website! Instead of computing the probability that "at least two" smartphone users use their smartphones in class, compute the probability that one or zero smartphone users use their smartphones in class.
Probability that exactly one smartphone user uses their smartphone in class: = 0.41 * 0.042181 * 7 = 0.1211
Probability that exactly zero smartphone users use their smartphones in class: = 0.0249
Probability that one or zero smartphone users use their smartphones in class:
0.1211 + 0.0249 = 0.1460
Therefore, the probability that "at least two" smartphone users use their smartphones in class:
1 - 0.1460 = 0.8540
