The television show Ghost Whistler has been successful for many years

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The television show Ghost Whistler has been successful for many years. That show recently had a share of 28, meaning that among the TV sets in use, 28% were tuned to Ghost Whistler. Assume that an advertiser wants to verify that 28% share value by conducting its own survey, and a pilot survey begins with 13 households have TV sets in use at the time of a Ghost Whistler broadcast.

Find the probability that none of the households are tuned to Ghost Whistler.
P(none) = 

Find the probability that at least one household is tuned to Ghost Whistler.
P(at least one) = 

Find the probability that at most one household is tuned to Ghost Whistler.
P(at most one) = 

If at most one household is tuned to Ghost Whistler, does it appear that the 28% share value is wrong? (Hint: Is the occurrence of at most one household tuned to Ghost Whistler unusual?)