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assume that when adults with smartphones are randomly selected, 51% use them in meetings or classes....

assume that when adults with smartphones are randomly selected, 51% use them in meetings or classes. if 9 adult smartphone users are randomly selevted, find the probability that at least 7 of them use thier smartphones in meetings or classes.

the probability is ___ ?
Math   Statistics-And-Probability   
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TOPIC:Binomial distribution.

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