Variance rules for statistics

[@xizhiluo6876]

thank you for sharing ,but 2:38 there is a mistake var(ax+by)=a2var(x)+b2var(y)+2abcov(x,y)

[@OliverAyto]

Yes, I saw this too

[@HelneitCo]

Thanks for the upload!

[@iskandariyah20]

thx for the upload,, btw 6:07 should be 8 instead of 10 :D *not really important thouhg lol