W3 E67 - description comment

[fatsu...@gmail.com]

Hi,

I'm having problems with week 3 exercise 67.

Hello! First of all, thank you for this awesome course.

I think it is not a mistake but rather a comment: the variation that is needed to be calculated in this exercise is unbiased. I was trying to use biased formula (with n as denominator instead of n-1), failed several times and only then found out that there are actually two formulas.

Just thought it would be cool if you would mentioned this issue in the exercise to help less math-talented students like me find the right formula. Thank you again!

Best regards

Alexander

[Jarmo Isotalo]

Thanks for the comment. I've added to our internal issuetracker and it'll get fixed eventually. 

Best,

Jarmo / MOOC-team

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