18 women have broken 2:48 this year, only 2 have broken 2:36
thank you for pointing that out.
I rather naively assumed the guy had done his homework, but it seems not.
I think you read it wrong. The table showed the number of marathon wins by British women and the number of those wins that were sub 2:48 not total runs (winning or not) that were sub 2:48. Two British women won marathons and both were sub 2:48.
The average of the top 10 British women is shown as 2:37:31 so obviously there have been a lot of sub 2:48s.