A **discrete** random variable is one whose possible values:
- Are finite or countably infinite
- Form an interval of real numbers (uncountably infinite)
- Are always negative
- Are obtained only by measurement
Show answer and solution
Correct answer: A. Are finite or countably infinite
**Discrete RV:** finite or countably infinite values (typically non-negative integers — number of heads, defective items, etc.).
Continuous RV has uncountably infinite values forming an interval.