In epistemological studies, two main interpretations of probabilities are the frequentist and the Bayesian. In this paper we first show that both interpretations are present in French Secondary schools, albeit the official curriculum only supports the frequentist approach. We then suggest a possible teaching situation to introduce teachers and students to the subjective-objective duality with some statistics training situations via the use of problem solving. We also give some characteristics and conditions useful to build situations fitted to this goal.