For Python: I am having difficulty creating my own test cases as suggested because I do not know how to create a 'scales' object. Do I need to import something from somewhere? What arguments are used to create the examples I would like to test with? Thanks.

I have several suggestions to improve this Kata.

I suggest that the title be changes to 'Variance in the length of words in an array'. This is a little clearer.

The section describing the requirement to limit the result to four decimal places was not clear to me. I suggest that in addition to updating the description that you also add a test case illustrating this requirement.

I am unfamiliar with the term 'aleatory variable' and prefer the term 'random variable'.

Thanks for your contribution.

The problem description was excellent with great examples. I appreciate that there were no 'surprise' test cases (i.e. not covered by the description).