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zouzou613
@zouzou613
June 2021
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AIDEEEEEEEEEEEEEEEEEEEEEEEEZ MOI SVP ! :( :( :(
Étude théorique sur 3 nombre a b c et leur moyenne x
1.Développer l'expression de la variance :
V= a²+b²+c² sur 3 - (x)²
2. Montrer que : 2ax+2bx+2cx=6(x)²
3. En réduire la formule de la variance
V=a²+b²+c² sur 3 - (x)²
4.Calculer la variance lorsque les trois nombres sont égaux
Propriété : La variance est la moyenne des carrés , le carré de la moyenne . Cette formule est très souvent utilisé dans les supérieurs .
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