According to the American Marketing​ Association, in one​ month, 25% of a social​ media's users were between 25 and 34 years old. If a random sample of nine adults was selected. Complete parts a through d.   What is the probability that exactly one adult from this sample was between 25 and 34 years​ old?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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According to the American Marketing​ Association, in one​ month, 25% of a social​ media's users were between 25 and 34 years old. If a random sample of nine adults was selected. Complete parts a through d.

 

What is the probability that exactly one adult from this sample was between 25 and 34 years​ old?

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What are the mean and standard deviation for this​ distribution?
 
The mean is
 
The deviation is 
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What is the probability that six or more adults from this sample were between 25 and 34 years​ old?
 
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Follow-up Question
What is the probability that fewer than three adults from this sample were between 25 and 34 years​ old?
 
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