"Probabilité de ne pas être cadre ou profession intermédiaire pour les diplômés du supérieur."

To me, that's not very clear. "Probability of not being a manager or professional person for university graduates." Are we talking about the chances that a graduate, upon graduation, has of becoming a manager/professional? Or, as you translate it, Jérôme, those graduates who do not currently hold a position of these two types?

The subject of the second graph : here I really think your translation is misleading. "Part des combinaisons études-emploi (stages, cursus en alternances)" refers specifically to vocational training schemes ie organized courses where on-the-job training is included. That is not "young people who both study and work" -- that gives the impression we are talking (as in previous discussion threads) about the extent to which students also have a job to pay their way through their studies.

Since you have the context these graphs were presented in, you could no doubt clear these points up? (when you have time..;))

in Australia, i dont really know rates of employment downunder but for what i see, lot of youth are working : employees at McDonald are not more than 15-16 yo and are paid around 5-$6/h instead of $12-15.

i think they have something like :

15-16 yo : 50% of the normal salary
16-17 yo : 40
18-20 yo : 25

that help our young fellows to get an professional experience and give them autonomy and maturity.