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:
Trial Balance
A trial balance is a bookkeeping report that lists the balances in each of an organization's general ledger accounts.
General Ledger
A complete record of all financial transactions over the life of a company, serving as the primary source for generating financial statements.
Entire Group
This term signifies the collective entirety of a set of items, individuals, or entities being considered as a whole.
Account
A record summarizing all transactions related to a particular item or person in financial accounting.
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