Nit: a quintile is a 5th of the population. The upper quintile would be the 20 people. You probably mean the upper vigintile (top 20th) if you want to limit it

Nit: a quintile is a 5th of the population. The upper quintile would be the 20 people. You probably mean the upper vigintile (top 20th) if you want to limit it to 4-5 people.