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L esp rance des rendements du march est de 2 0 % , l cart type de 2 5 % . Le taux sans risque

Lesprance des rendements du march est de 20%, lcart type de 25%. Le taux sans risque est de 7%.
1- Le titre i est sur la frontire defficience, il a une esprance de 30%, quel est lcart type des rendements ? Quelle est la corrlation avec le march?
2- Le titre j a une esprance de 35% et un cart type de 65%. Quel est le risque systmatique et le risque spcifique de ce titre ?

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