If we have probabilities for disjoint events:
$A, B, ..., \text{i.e.:}\space P(A), P(B), ..., \text{and}\space P(A) + P(B) + \ldots = 1$
then does this in fact mean, that there is a system, that has its activity (or in fact some abstract resources, that lead to the activity) partitioned between different tasks $A, B, \ldots$ ?
Seeing the probabilities as percentages of system's resources devoted to different tasks – is this a correct and useful approach, investigated in mathematics?