Answer :
Answer:
VI schedule.
Explanation:
a Variable Interval schedule (VI) is you are conducting an experiment with different variables but all of those variable have to be applied after a stablished average, for example, there is an experiment of a rat pressing a lever with an average of 10 seconds, the first time, the rat will press the lever exactly at 10 seconds, after that, the rat can press it after 30 or even after 2 seconds, as long as the 10 second average isn't lost.