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 marginal probability distribution of the number of Blackberries sold daily.
Definitions:
Antipsychotic Drugs
Medications primarily used to manage psychosis, including hallucinations, delusions, schizophrenia, and bipolar disorder.
Schizophrenia
A mental disorder characterized by abnormal behavior, thought patterns, and a diminished ability to understand reality.
Client-centered Therapists
Therapists who employ a non-directive form of talk therapy emphasizing unconditional positive regard, empathy, and genuineness towards the client.
Directive
An instruction or order given by someone in authority.
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