Aclass tossed coins and recorded 161 heads and 179 tails. what is the experimental probability of tails. round your answer to the nearest whole number

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?