PLEASE HELP ASAP!!! I dont understand how they want me to do this. could someone please explain how to do it along with the answer?

Use the data given below to answer the following questions.

68, 63, 67, 66, 65, 87, 69, 61, 86, 82, 28.

A. What is the outlier of the data? Explain why you consider this number the outlier.

B. Calculate the mean of the given data set. You must show your work to receive all possible points.

C. Calculate the mean of the given data set excluding the outlier value. You must show your work to receive all possible points.

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?