I could do that, but I do not know how to read each line seperately.

Sure you do. The following statement in your posted code does just that:

strLine = br.readLine()

I was able to add up all of the integers, and display what it equals, but now how do i get the mean or avg of these?

Did you read what I said near the bottom of my other post? Pay more attention to the second example or think of a third way. To get an average you will need to know how many numbers were added together right? Going to have to count how many numbers you add up then... Figure out a way to do that.

For some reason, it is printing out the mean of each seperate integer, but it want it only to calculate once with the total of all integers

The computer just does what the code tells it to do when it is told to do it. If you find something happening to every number as it goes instead of one time at the end, consider where the line of code is placed in terms of when and how many times it will run.