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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.
Problem is, the description is talking about the sample standard deviation, while the kata expects population standard deviation, which are different things.
Nice kata :) Random tests needed. If you would need some help I'm always glad to help out.