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Random sequences, where stability in the relative frequencies had to be taken into account, were analyzed. The heuristics of representation was proved. Two different examples of open situations, where each interviewee was asked to make an estimate of probabilities and a justification for his answer were presented. In the first one, the enquiry was proved when comparing proportions of two samples of different size; in the second situation this notion expressed through the stability of the relative frequencies in series of repetitions of random experiences. Two hundred and seven students being admitted to university were given the devices. Their answers were categorized taking into account the level of cognitive comprehension achieved. The answers were grouped in different categories Correct and Incorrect for both devices as well, and a connection between them was found.

Sesgos en la Estimación de Probabilidades para Dos Situaciones Secuenciales Aleatorias