
3 Random Variable Models
Section 3.1: Probability Distribution Function
3.1. Can the following functions in Figures 3.41 (a), (b), (c) represent possible probability distribution
functions? Explain.
Figure 3.41: Possible probability distribution functions.
Solution: Figures (b) and (c) can be possible distributions, but Figure (a) cannot be because F (x) cannot
decrease in value as x increases.
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