Usage Note
Promeder is not a standard word; the correct lemma is promediar, a regular -ar verb meaning 'to average' or 'to reach the midpoint'. The related noun is promedio (average, mean). Use promediar in every register: promediar los resultados = to average the results.
Examples
"Hay que promediar los tres resultados."
Natural Translation
You need to average the three results.

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