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} Verify that V(X + Y)= V(X)+ V(Y).Did you expect this result? Why?
Definitions:
Stage 1 Sleep
The initial stage of sleep characterized by light sleep, where one can be easily awakened.
Theta Waves
A type of brain wave pattern associated with light sleep, deep relaxation, and meditation, typically in the frequency range of 4-8 Hz.
REM Sleep
A phase of sleep characterized by rapid eye movements, more dreaming, and bodily movement, and faster pulse and breathing.
Sleep Spindles
Bursts of oscillatory brain activity visible on an EEG that occur during stage 2 of NREM sleep, thought to play a role in learning and memory consolidation.
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