Proactine, a new medicine for acne, is claimed by the manufacturer to be 80% effective. It is

Question:

Proactine, a new medicine for acne, is claimed by the manufacturer to be 80% effective. It is applied to the affected area of a sample of 15 people. What is the probability that:
a. All 15 will show significant improvement?
b. Fewer than 9 of 15 will show significant improvement?
c. 12 or more people will show significant improvement?

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