I need to write a program that asks for the file name of a text document of number and then calculates average, median, etc., from this data set. I have written the program so
Your file should be in the class-path. That's in the same directory that your main class is in.
The suggested practice is to place it in a Resources directory inside your class-path, then you can access it via, "Resources/inputValues2.txt".
Resources
"Resources/inputValues2.txt"