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It is reported that 25% of American households use a cell phone exclusively for their telephone...

It is reported that 25% of American households use a cell phone exclusively for their telephone service. In a sample of twelve households, find the probability that:
  
a.

No household uses a cell phone as their exclusive telephone service. (Round your answer to 4 decimal places.)
  
  Probability   


b.

Exactly 6 households exclusively use a cell phone for telephone service. (Round your answer to 4 decimal places.)
  
  Probability   


c.

Find the mean number of households exclusively using cell phones. (Round your answer to 4 decimal places.)
  
  Mean   
Math   Statistics-And-Probability   
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