The volume V, in liters, of air in the lungs during a three-second respiratory cycle is approximated by the model  V = 0.1729t + 0.1522t2 − 0.0374t3,  t is the time in seconds. Approximate the average volume of air in the lungs during one cycle. (Round your answer to four decimal places.)

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The volume V, in liters, of air in the lungs during a three-second respiratory cycle is approximated by the model 

V = 0.1729t + 0.1522t2 − 0.0374t3,

 t is the time in seconds. Approximate the average volume of air in the lungs during one cycle. (Round your answer to four decimal places.) 

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