4H has about 7 million members, all somewhat rural/outdoors in outlook and not all farm oriented, as a likely upper bound. Maybe 3 million kids would be expect

4H has about 7 million members, all somewhat rural/outdoors in outlook and not all farm oriented, as a likely upper bound. Maybe 3 million kids would be expected to milk a cow, so maybe 1 in 20. In some states, nearly a million people per year visit the state fair and most would experience the "milk a cow" booth so essentially all kids above a relatively low socioeconomic level have made a pitiful attempt at milking a cow. Under a very broad and unassuming tent, perhaps a third of kids could be considered able to "manage to milk a cow". My minimal experience in cow milking is its hard to fail completely as long as you're not kicked in the face, but it is the kind of skill where experience and intelligence could pay off. Which brings us back around to an obvious comparison with the general public experience of mass market GUI user interfaces, LOL.