Which weighs more 2.5 pounds of rocks or 40 ounces of feathers

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?

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25