According to a poll about phone use, 25% of all U.S. households are "wireless only," meaning they do not have a land line. In a

Question

According to a poll about phone use, 25% of all U.S. households are "wireless only," meaning they do not have a land line. In a random sample of 15 households, what is the expected number of households that are wireless only? 
4 
3.75 
3 
0.25

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