What two numbers does the square root of 2 lie between

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

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?