Standard Deviation of a Probability Distribution

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chordringer

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In a recent study, twenty-two percent of the homes in the United States were found to own an NFL jersey. In a sample of ten homes, What is the standard deviation of the probability distribution?


Alright, I know that I need to determine the variance and then use that to find the standard deviation, however, I am having a problem just discovering how in the to determine the probability distribution. Needing help on this badly.

Thanks,

Jason
 
The either have a jersey or they don't. Isn't that binomial?
 
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