29. Medical Helicopters In a study of helicopter usage and patient survival, res

Question

29. Medical Helicopters In a study of helicopter usage and patient survival, results were obtained from 47,637 patients transported by helicopter and 11,874 patients transported by ground (based on data from "Association Between Helicopter vs Ground Emergency Medical Services and Survival for Adults with Major Trauma," by Galvagno et a., Journal of the American Medical Association, Vol. 307, No. 15) a. I of the 159,511 patients in the study is randomly selected, attherobability that the subject was transported by helicopter? b. If 5 of the subjects in the study are randomly selected without replacement, what is the prob- ability that all of them were transported by helicopter?

Explanation / Answer

a) here as 47637 out of 159511 were transported through helicopter ;

therefore probability that person was transported by helicopter=47637/159511=0.298644

b) probability that al of then were transported by helicopter

=(47637/159511)*(47636/159510)*(47635/159509)*(47634/159508)*(47633/159507)=0.002375

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