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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.
Don't you need to make the average a float?
The problem here is that whenever a negative number is passed as argument, the method will throw an exception. Wouldn't it be better to check if the number isn't negative?