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exercice 7
p(x<0.2)=0,2*(1/1)=0,2

p(x>3/7)=1*0.58=0,58

exercice8
p(x<7)=3*0,1=0,3

p(x<10)=6*0,1=0,6

p(7<x<10)=3*0,1=0,3

E(x)=((4+14)/2)=8

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