I think what is meant is that 90% are rejected at the phone screen, and the top 10% or 1% are of those who can code, ie passes the phone screen. That makes them

I think what is meant is that 90% are rejected at the phone screen, and the top 10% or 1% are of those who can code, ie passes the phone screen. That makes them 1% or 0.1% of your initial applicant pool.