C3_W3 sample variance

this lecture.
This image is confusing: why not subtracting one from n in the second equation:

To me, that appears to be a mistake in the slide.

Thanks TMosh

to continue on the same topic. At minute 4.2 instructor says variance grows larger as n grows. I am confused

Then hew says at minute 7 he says variance grows smaller as n grows


I believe he’s talking about the general characteristics of large data sets, not a specific equation.

It’s all vaguely discussing the Central Limit Theorem, but not really doing a very clear job of it.

Thanks TMosh.