"First, Chinese Aucklanders tend to be young, and tend to have low incomes."

But then...

"While the ethnically Chinese population makes up 9% of Aucklanders, it makes up only 5% of Aucklanders on high incomes."

Wouldn't that mean that more than half of (126,000) Chinese population in Auckland are on high incomes? How is that 'tend to have low incomes'?