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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I tried rounding down and still can't figure it out
This comment is hidden because it contains spoiler information about the solution
The tests in Racket are the same as in other languages. Your code is wrong because you think that fractional parts of people give birth which is usually considered as wrong.
Edit: since you "passed" the kata look other solutions that are not wrong.