When I'm talking to students I remind them that averages (especially means) can be really hard to interpret for things like this, especially when you factor in gap/growth years, non-traditional applicants, and the fact that everyone has a slightly different path / set of strengths.
As was pointed out upthread, full-time work for a year is ~ 2000 hours. So someone who takes 2 years to work full time as a researcher (not that uncommon) heavily tips the scale: 1 person with 4000 hours and 3 other people with 400 hours each give you an "average" of 1300, but doesn't tell you much useful when you're planning your time as an applicant.
For "average" programs, my advise to students is they need to stand out in some way that matches their narrative and motivation and future goals. They don't have to stand out in every single one. For some, they have excellent grades and a great MCAT score. Others have a ton of community service (or did something like Americorps/Peace Corps/Teach For America post-graduation). Some will work for 1-3 years in a clinical position post-graduation and have thousands of hours of clinical experience.
In my experience, the yearly infographic just panics all of my applicants and makes them think they should be aiming for those numbers, rather than focusing on shoring up weaknesses (getting them out of red-flag territory) and boosting strengths.