"Mathematical and statistical techniques" is a basic science of modern technical research, which is often used in the processing of big data.

The "weighted average" is a scientific means of dealing with "performance".

"Weighted average" of data sources from different ways; each source of data in the "weighting algorithm" in different proportions, based on the above premise of the average score, that is, the weighted average score.

The statistics year-semester weighted average is the weighted average of the yearly scores (from an identified source) and the semester scores - potentially a measure of an effect.