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Can someone please help me with this statistics question?
In a study of helicopter usage and patient​ survival, among the 52,808 patients transported by​ helicopter, 248 of them left the treatment center against medical​ advice, and the other 52,560 did not leave against medical advice. If 40 of the subjects transported by helicopter are randomly selected without​ replacement, what is the probability that none of them left the treatment center against medical​ advice?

Respuesta :

CastleRook
Probability of an event happening is given by:
probability of an event happening=number of ways it can happen/total number of outcomes
number of random selection=40
total number of patients who did not leave against medical advice=52,560
thus the probability that at random selection none of the 40 patients left the treatment center against medical advice will be:
40/52560
=0.00076