How to Derive Upper and Lower Bounds for a Random Variable?

[Chriszz]

Dears,

If a random variable is generated with the pdf of p(f) = 1/(f^x),
how can I derive the upper bound or lower bound of the random variable?

Thanks,

 

[Dickfore]

Use the properties:
$$p(f) \ge 0$$

$$\int_{f_\mathrm{min}}^{f_\mathrm{max}}{p(f) \, df} = 1$$