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To calculate the median number of a set of figures. In this usage, a noun or pronoun can be used between "average" and "up." You need to average up your expenses and make a budget for yourself. I haven't averaged the kids' test scores up yet, but I don't think it will be a very high number, as most of them failed.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
average something up
to calculate the average of a set of figures. Please add these figures and average them up. Please average up all the monthly expenses for the previous year. Will you please average these figures up on the calculator?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.