Mathematically correct, but misleading from the standpoint of precision in writing. In terms of a conclusion in a technical report, "most" isn't strong. Would you fly on an airlines that tells you, "Most of the time, we don't crash."?
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Not any less than if the airline report said "We can say with that we don't crash an overwhelmingly majority of the time."
Since you're analyzing it so deeply though, when is most no longer "most," but more "overwhelmingly majority" or something else so to speak? Furthermore, what if someone disagrees with your interpretation, or your interpretation isn't as known so someone uses it under a different standing? Is 80% most? 90%? 95%?
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If you really want to know, and not just argue, just get a copy of that report and read the whole thing. I can assure you from the language of the conclusion that the entire report will include discussions with real percentages. The summary, on the other hand, is an attempt to put the report into layman's language. Believe what you want, but in the world of technical writing, "most instances" means a majority and nothing more. It isn't a comforting thing.
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Where can I get it?