xkcd #3149: Measure Twice, Cut Once
Title text:
“Measure zero times, cut zero times.” --carpenter who has achieved enlightenment and realized the wood is fine where it is
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3149/
This assumes there are no differences in skill level for serial killers…
No, it just implies that there is not a strong correlation between skill level and the number of measurements and cuts.