Ana tiene que tomar un jarabe por 20 días, el doctor le ha recetado 3 frascos de 20ml cada uno, tiene que tomar el jarabe de tal manera que cada día que pasa toma 5ml menos que el día anterior

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The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.