So I was taking an assignment on Edx for data science course and this happened.

I checked my calculations and I still got 4.17. When I raised re-evaluation, I realised I wasn't the only one who had the same issue.

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DeWayfarer · 61-69, M

Probably a hard coding problem. The answer probably reflects other data and is not calculated from the current data.

They changed the data without changing the answer.