The diagram below identifies the elements of service as provided by a soft drink vending machine. Each element has an estimate of its own reliability, independent of the others. What is the reliability of the "system"? 
Definitions:
Russian Revolution
A series of political and social revolutions in Russia in the early 20th century that dismantled the Tsarist autocracy and led to the rise of the Soviet Union.
Armenian Genocide
The systematic mass killing and expulsion of ethnic Armenians by the Ottoman Empire during World War I.
American Attitude
The collective mindset or cultural outlook of the American people, which can vary widely on issues ranging from politics to social values.
Felix Frankfurter
An associate justice of the United States Supreme Court who served from 1939 to 1962, noted for his liberal judicial philosophy and advocacy for civil rights and liberties.
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