Boston University grad students analyzed more than four million pitches from 11 seasons of Major League Baseball (2008-2018), and the findings aren’t great for human umpires. According to the study, umps made 34,294 incorrect ball and strike calls in 2018. That works out to 14 blown calls per game …

https://techcrunch.com/2019/04/08/a-new-study-of-mlb-pitch-calls-makes-a-strong-case-for-robotic-umpires/?renderMode=ie11