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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.
Faced same issue. Population can't be fractional, it's always an Integer.
You're passing a non existant key to the dictionary.
When calculating the population, you're computing a population with a fractional part so you'll need to account for that.
It means you returned 3 but you should have returned 4.
Probably means your function returned 3, but should have returned 4