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Something like 80% of all stats are made up on the spot

84.2% of stats are more likely to be believed if they include a decimal point

84.27% of stats are even more credible with double digit decimal point.

Except if they contain rounding errors.

too many decimal points just look fake though, so it's a fine line

84.000000001% of all statistics are calculated using IEEE floating point numbers.

84.2% of the time, this is true every time.

Especially vendor statistics about how useful their product is, how much money it's going save you and what the performance is.

I usually ask for proof of such claims. That makes the first vendor call interesting.