Biostatistics is the processing of computer-based observations of living organisms. For our target audience, the reference to a model such as the Gaussian model, which is the focus of this article, constitutes an epistemological obstacle due to their inability to perform mathematical modelling. The interactive graphical representations on which our web-based teaching tool is based still remain largely inaccessible to them. Conceptual appropriation is made possible through the measurement of objects and the transfer of real data from a spread sheet into an actual histogram. This practical approach was made possible by the release of instructional time thanks to the transfer of part of the learning process to a computer-based system.