Below is the graph of the rate r at which people arrive for lunch at Cafeteria Charlotte.Checkers start at 12:00 noon and can pass people through at a constant rate of 5 people/minute.Let f(t)be the length of the line (i.e.the number of people)at time t.Suppose that at 11:50 there are already 150 people lined up.Using the graph together with this information, sketch a graph of f. 
Definitions:
Variable Interval
A reinforcement schedule in which reinforcements are given after unpredictable time durations.
Fixed Ratio
A schedule of reinforcement where a response is only reinforced after a specified number of responses.
Variable Ratio
A reinforcement schedule in which responses are rewarded after a varied number of responses, enhancing motivation.
Puzzle Box
An experimental apparatus used in animal learning studies, especially with cats, to observe problem-solving behavior when an animal is placed in a confined space with a mechanism to open a door.
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