Find the mean absolute deviation of this set of data 28,45,12,34,36,45,19,20

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?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Edger needs 6 cookies and 2 brownies for every 4 plates how many cookies and brownies does he need for 10 plates