# How to get this number? Watch

1. I spend alsmost all day sreaching the answer but I still do not have it. SO
Ex=m*n=963,828*25=24095,7
m - mean
n - sample size
Ex^2=24991420,5
(I'm analyzing exaple, and I do not get how they get this number, because 24095,7^2 is NOT 249991420,5
So how to get it?
2. (Original post by Vasare)
I spend alsmost all day sreaching the answer but I still do not have it. SO
Ex=m*n=963,828*25=24095,7
m - mean
n - sample size
Ex^2=24991420,5
(I'm analyzing exaple, and I do not get how they get this number, because 24095,7^2 is NOT 249991420,5
So how to get it?
(I assume when you write E you mean . Also this is the wrong forum, there's a maths help forum elsewhere.)

Ex^2 is not (Ex)^2. It means

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