[pc86]

I like your Chinese example because it made me think about the root question, but I think there’s an important distinction to be made in that while only a plurality of people speak Chinese natively (and a small one at that, less that 1 of every 5 people), a majority of people use the full stop decimal notation (and a decently large one at that, 3 of every 5).

If you pick a language at random, it is more likely to not be Chinese than it is to be Chinese, but it is more likely to be Chinese than any other single language. However, if you pick a notation at random it is both more likely to be full stop than any other notation as well as more likely to be full stop than any other specific notation (I believe the chart only showed three examples). I didn’t take the time to look into it but it also appears that weighting each country equally (e.g. Luxembourg = China for probability’s sake) would shift the balance in favor of comma notation, which may belie more cultural or regional significance than simply focusing on the population percentage.