# Finding the number that's less than 90% of result set

Forgive if this sounds vague or poorly worded. I'm struggling to pinpoint the right terminology of what I'm looking to do. Hoping someone here can push me in the right direction.

So I have a set of numbers. Say: $15, 22, 15, 10, 20, 20, 13, 13, 22, 23, 13, 22, 20, 8$

I'd like to know what would I need to do to calculate the number that is approximately Less Than or Equal to $90\%$ of each these numbers as a whole (but not less than $90$).

Just playing around I know I'd want 10 (is Less Than or equal to 13 out of 14 numbers) but I'm not sure how to solidly calculate this.

Any help would be great! =)