Question

selections done WITH replacement. In one town, 28% of households have wireless internet service.

A. In a group of 6 randomly selected homes from the town what is the probability that none have wireless internet service?

B. what is the prob that 6 randomly selected houses all have wireless internet service?

C. What is the prob that in a group of 6 randomly selected households, atleast one has internet service?

Answer 1

28% have wireless so evidently 72% do not. the probability that none have wireless is
\[(.72)^6\]

Answer 2

the probability that all 6 do is
\[(.28)^6\]

Answer 3

and finally "at least one" means "not none" so take the answer to the first question and subtract it from 1