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:
Sympathetic Stimulation
Activation of the sympathetic nervous system, resulting in physiological responses such as increased heart rate and blood flow to muscles.
Metabolic Rate
The rate at which the body uses energy to maintain basic vital functions such as breathing, circulation, and cell production.
Precapillary Sphincters
Ring-like muscles located at the entrance of capillaries, controlling blood flow into the capillaries by contraction and relaxation.
Interstitial Pressure
The pressure within the space between cells, which can influence fluid movement and absorption in tissues.
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