Grade averaging (by arithmetic mean) is often performed as an attempt to assess overall student performance. In the case of
grade comparison originating in non-equivalent scales, rank errors and absurd averaging may result. As averages are sometimes
used for candidate selection, the paper dicusses how decisions based on arithmetic mean interpretation may be true, false,
or fuzzy, according to
... [Show full abstract] different categories of participating candidates. A two stage selection process is analyzed from the
perspective of candidate categories. The impact of the choice of asessment scale on the decision-making process is also evaluated
and statistical biases are identified. The relevance of using a uniformity criterion is demonstrated.