The intuitions and heuristics about probability in 257 engineering students are evaluated through a questionnaire of eight closed items, and the arguments of 148 of them are analyzed in an open item. The results indicate a high variation in the qualitative assignment of probabilistic intuition in situations of uncertainty and the existence of correct and incorrect intuitions of the students. We propose a teaching of probability that relates the theoretical and practical understanding of the meanings of probability, ranging from the intuitive to the axiomatic, through the qualitative estimation of probabilistic intuitions as a degree of personal belief, and the explicit confrontation of the various heuristics with formal knowledge of probability.
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