Select the sum of the series. ∑4k=1k2

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

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?

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?