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Not entirely sure if my output is the same, some of my figures look a little different but not sure if this is just down to rounding.
Gave my interpretation of the solution.
Note: If the required amount of previous months weren't available to calculate the specified running avg, I assigned the result as null; i.e. if you are in Feb, and only January is available as a prior month, we shouldn't be able to do (Jan+Feb/)2 as that's a 2-month running avg, so I'd assign Feb as a null. Correct me if this assumption is wrong! 🤓
