Find the coordinate of the midpoint of the segment with the given endpoints -7 and 4

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?

Use the distance formula to find the distance between (-3,5) and (3,1)

How can you check that you have correctly converted frequencies to relative frequencies?