j'ai un tableau
                                                                                                                   hommes                     femmes
          

dejeunent regulierement au                                                          110                          55                             restaurant                                                                                                                          
                                                                

dejeunent parfois                                                                                   42                             33

ne dejeunent jamais                                                                               58                           77

on choisit un salarie au hasard

calculez la probabilite que ce salarie soit un homme sachant qu'il ne dejeune jamais au restaurant