Mobile Phones Sales
After analyzing sales data,the owner of a Mobile Phone store produced the following joint probability distribution of the number of iPhones (X)and Blackberries (Y)sold daily. 
-{Mobile Phones Sales Narrative} Find the probability distribution of X + Y.
Definitions:
Spine Manipulation
A therapeutic intervention primarily used by chiropractors to relieve back pain through application of controlled force to the spine.
Complementary Medicine
A range of medical therapies that aren't part of standard medical care but can be used alongside it in the treatment of diseases and health conditions.
Alternative Medicine
Therapeutic practices and treatments that are not typically included in the realm of conventional Western medicine, such as acupuncture, herbal remedies, and homeopathy.
Mind-body Approaches
Techniques or therapies that aim to improve health and well-being by enhancing the connection between the mind and the body.
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