For scores in B2:B10 and weights in C2:C10, the weighted total is =SUMPRODUCT(B2:B10,C2:C10)/5 if weights total 100. Example ratings 4,3,4,5,4,3,4,3,5 yield 77/100 (illustrative; not a real supplier). Have two reviewers score independently, compare differences above one point, and request clarifying evidence.