Removing Empty Fields from Calculation

Hello,

I am trying to create a calculated field using a script that calculates the average of several fillable lines. The issue I'm running into is that some of these fields may not be filled out. One instance could have all 10 values filled in, but another instance could have just 7/10 fields. The calculation is counting the empty fields as zeroes rather than excluding them from the calculation. Any ideas?

Thanks!