Golfing Store
The joint probability distribution of variables X and Y is shown in the table below,where X is the number of drivers and Y is the number of putters sold daily in a small golfing store. 
-{Golfing Store Narrative} Find the probability distribution of the random variable X + Y.
Definitions:
Fixed-ratio
A schedule of reinforcement where a response is reinforced only after a specified number of responses, often used in behavior analysis.
Biological Predisposed
An inherent inclination or natural tendency for individuals to exhibit certain behaviors or characteristics due to genetic factors.
Aversive Events
Incidents or stimuli that are unpleasant or noxious, leading to avoidance behavior.
Fixed-interval
Refers to a schedule of reinforcement where a response is rewarded only after a specified amount of time has elapsed.
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