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function f(x) { y = 1/0; return y }

// weighted mean / media pesata
function Wmean(x,m) {n=x.length; Smx=0; Sm=0; for(i=0;i<n;i=i+1) {Smx=Smx+x[i]*m[i]; Sm=Sm+m[i]}; return Smx/Sm}

aX = -5; bX = 5; aY = -5; bY = 5
Dx = 1; Dy = 1

Px=[-3,4,-2]; Py=[-3,3,4]; Mxy=[12,20,8]
BARx=Wmean(Px,Mxy); BARy=Wmean(Py,Mxy); Q1x=[BARx]; Q1y=[BARy]
C1="orange"; L1x=[-3,4,-2,-3]; L1y=[-3,3,4,-3]

AX=BX=AY=BY=""
BY = "y = "+BARy; AY = "x = "+BARx

AAX=aX; BBX=bX; AAY=aY; BBY=bY

linew=1

T0=["8 kg",-3,4.5]; T1=["20 kg",4,3.5]; T2=["12 kg",-3,-3.6]