I am making a few assumptions here, but I think 1 in 100 young people have DACA.

I think most DACA are between ages of 25 and 35. This totals to 800,000.

The population of US between 25 and 35 is about 85.2 million.
according to here: http://www.marketingcharts.com/featured-30401

so 800,000 is about 1% of 85.2 million.

Therefore about 1 in 100 young people aged 25 - 35 is on DACA.

So in a room of a 100 ppl aged 25 - 35, you have at least 1 recipient of DACA.