Acar travels at 40km/hr for 2 hours and at 55km/hr for 2 hours how far as the car traveled? what is it's average velocity show me how?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?