What percent of 43.75 is 70

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?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog