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Roughly 80% of Americans live in cities while 20% live outside urban areas. I took a...

Roughly 80% of Americans live in cities while 20% live outside urban areas. I took a sample of 102 UO students and asked them if they grew up in a city or not. If the type of environment one grows up in (city or not) was unrelated to subsequent college attendance, what would be the expected number of UO student reporting that they grew up in a city?

please provide the solution and a step by step explanation

Math   Statistics-And-Probability   
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TOPIC:Binomial distribution.

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