A 22-year-old student has to have a physical examination to certify that he is able to participate in interscholastic athletics.During the cardiovascular examination,you report his heart rate as 60 beats/minute and his arterial blood pressure as 118/68 mm Hg.According to echocardiographic study,his end-diastolic volume is 150 mL and his end-systolic volume is 60 mL. The patient's mean arterial pressure is estimated as:
A)68 mm Hg B)77 mm Hg C)85 mm Hg D)92 mm Hg E)118 mm Hg