Would a packed Wembley stadium be likely to have a descendant of the Mongols inside?
Let's be accurate as possible and think first.
yes
Wembley stadium has a capacity of 90,000 people.

The Mongols were an ethnic group that dominated the 13th and 14th centuries.

Genghis Khan was the founder of the Mongol Empire.

Geneticists have determined that 1 in every 200 men are descended from Genghis Khan.

.

Therefore, the answer is yes