(Answered) A new drug is found to be effective on 90 of the patients

Statistics

A new drug is found to be effective on 90% of the patients tested.

Is the 90% effective rate best classified as a priori classical probability, empirical classical probability or subjective probability?
If the drug is administered to 20 randomly chosen patients at a large hospital, find the probability that it is effective for:
fewer than five of the patients
10 or more of the patients
all 20 of the patients

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