What are the basic ways that governments are formed and how do they serve the people who live under them

What is the average rate of change for this function for the interval from x=2 to x=4 ?

This is different from the first one can someone me

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?