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Score non-respone on a quiz question as blank, not zero

Question asked by Thomas Rietz on Oct 15, 2016
Latest reply on Oct 17, 2016 by Kona Jones

Is it possible to score a non-response on a quiz question as blank (or nothing) instead of 0?  I'd like to track % right as a fraction of questions that were answered in addition to % right overall.  I could also work it out if there was just a statistic somewhere on fraction of questions answered that ends up in the gradebook with the score.