The point in between is (1,2)
For the mean you add them all up and divide by the ammount of numbers you added. So it would be 118
Y=4x+1 is the answer to your question
I am not sure exactly what you are looking for is this problem. Are you given choices from which to choose?
The empty set is a set with no numbers. Therefore, you should look for a set that doesn't have any elements.
