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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.
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Thanks for pointing this out. I think this should have been made clear in the description of the task. I used Python's built-in function variance and got the 'wrong' result, after that I checked manually and confirmed my variance was correct, so I gave up, assuming it was a problem with the Kata. Turns out I was off by just a factor of 11/12th. Very confusing description.
Not a suggestion.
They are asking for VARIANCE. not standard deviation. calculate accordingly. also, note they want 'POPULATION' variance...not for a sample size. So, the denominator is NOT reduced by 1.