Given that 29% were tuned to lett3rs;
Then, 71% were not tuned to lett3rs.
(a) The probability that none of the households are tuned to lett3rs is;
(b) The probability that at least one household is tuned to lett3rs is;
(c) The probability that at most one household is tuned to lett3rs is;
(d) Since the probability of at most one is less than 5%, then No, It is not wrong.