What term do historians use to describe the personal preferences people have that affect their interpretation of event?

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

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?

Which one is the correct answer, and why?