Standard deviation on java from a file

Question

I need to calculate the standard deviation from some doubles on a file... so far I only have the mean value
https://code.sololearn.com/cKzACGhPyf7L/?ref=app

Answer 1

you need to access those values like count, etc if they are on a different file, also you haven't declared those reader. hasNext()

Answer 2

i didn't declared them to save time here... on my original code i have them declared