That doesn't make any sense though. For me to base it off all the Somali women I've known over the age of 40 I'd be relying on my memory. What if I can only remember the fat ones? What if I forget about a certain group that would change the outcome. Not to mention that the memory can work with your bias and you'll only remember the memorable xaliimos and they may just happen to be fat. Which is why said look at the ones you do know right now and compare them.That's not how statistics work . You base it on all the Somali women you've seen in your life over the age of 40 (we don't have actual stats) and compare them to the average body composition in the west (sans US) of the same age group.
It's not only Somalis... First gen arabs, latinos even asians.
However 2nd, 3rd generation etc are much in line with the mean.