A company set up a kiosk in the Mall of America for several hours and asked randomly selected people which color cell phone cover was their favorite. The results follow: 
What is the probability that black is the favorite color, given that the person's age is 21 or older?
Definitions:
Sub-Saharan Africa
The area of the African continent which lies south of the Sahara Desert, characterized by diverse cultures, languages, and ecosystems.
Jimmy Carter
The 39th President of the United States, serving from 1977 to 1981, notable for his work in diplomacy, environmentalism, and later, humanitarian efforts.
Shah Mohammed Reza Pahlavi
The last monarch (Shah) of Iran before the Iranian Revolution of 1979, known for his efforts to modernize and Westernize Iran.
Political Freedom
The right of individuals to participate in political life, including the freedom to express opinions, join political parties, and vote without coercion.
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