Answer:
Variable-ratio schedule
Step-by-step explanation:
Variable-ratio schedule: In psychology, the term "variable-ratio schedule" is determined as one of the distinct schedules of reinforcements which is a part of the "operant conditioning theory". It tends to occur when a specific response is being reinforced after an unforeseeable number of certain responses.
A Variable-ratio schedule tends to create a high responding rate. Lottery games are one of the best examples of the given schedule.
In the question above, the given statement represents "variable-ratio schedule".