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- Observe whether the red line Metro train departs on time.
Let Z represent that the train departs on time.
- Here we have defined a random variable to represent a categorical (qualitative) variable.
- Note: It is usual practice to assign a 1 to the outcome we wish to observe, a 0 is assigned to the other outcome.
- In a typical 5-day work week, observe the number of days that the red line Metro train departs on time for a commuter.
Let D = number of days the train departs on time.
D = { 0, 1, 2, 3, 4, 5}