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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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You're calculating the "sample variance" while the "population variance" is required. I think the link in the notes includes the explanation on how to get the expected result.
Can you elaborate please? What do you mean divide by n ? What is n
They want the population variance (divide by
n). The larger number is the sample variance, corresponding to a denominator ofn - 1.