In this paper, we propose a statistics model to better understand the
probabilistic interpretation for fuzzy sets. The model shows the relat
ionship between the two kinds of statistics: the set-valued statistics
for fuzzy sets and the conventional probability statistics for member
ship functions. Our model overcomes the shortcomings in previous appro
aches. The results of this paper provide a theoretical interpretation
to Zadeh's insight that possibility relates to soft constraints restri
cting the values of language variables.