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EXERCICE 1 : : (5 points) Quatre affirmations sont données ci ... 18. 20 classes [10;20[ [20;40[ [40;60[ [60;80[ [80;100[ fréquences 0,16 0,3 0,25 0,19 0,1 fréquences 0,32 0,17 0,15 0,28. 0,08 ?? x = 13,25?????????????????????