I was hoping for some help debugging this ruby script. I'm having trouble using the output function from outside the class

I'm having an issue with calling the method output statically from outside of the class. I get this error: undefined method output' for #<WeightedScore:0x007ffb3815d840> (repl):58:in' (repl):9:in `'

My Code: Ruby Script

Thank you for the help!