78. At Dolon General Hospital, 30 percent of the patients have Medicare insurance (M) while 70 percent
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78. At Dolon General Hospital, 30 percent of the patients have Medicare insurance (M) while 70 percent do not have Medicare insurance (M). Twenty percent of the Medicare patients arrive by ambulance, compared with 10 percent of the non-Medicare patients. If a patient arrives by ambulance, what is the probability that the patient has Medicare insurance?
A. .7000
B. .5000
C. .4615
D. .1300
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