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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.
I got error with just "array.Average();"
You need to use Linq library
you can completely get rid of the ternary operator and just return the average as the Average method already returns 0 for an empty array.
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I mean, mine used it as well
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