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SUBMIT YOUR IDEAI don't have the same results for average age, but I did include totals for all countries.
Trying a spoiler for the first time.
Used 8-5-2016 as the start date for the Rio Olympics.
As a few others have mentioned - I also get results different from the solution provided. Using the CreW Expect Equal Tool reveals the issues, there's a handful or so errors: So for example it says there's a problem in row 23; checking the solution provided, row 23 is Bhutan with 2 Female Athletes, 0 (or [Null]) Male Athletes - and then [Null] Total Athletes! That can't be right.
My solution, also get 5 records wrong because not correct value in output given as for other people.
I love these summary/fact-finding challenges! Like others, I had a couple of discrepancies in the total athlete counts likely due to null counts for one of the genders (I'm pretty sure my solution is correct).
Fun fact: one of my colleagues is an athlete in this dataset!