On the basis of physical examinations of approximately 40,000 Americans at least 12 years of age, researchers deter- mined that 20.3% of the sample had hearing loss.
a. If four individuals of the study are randomly selected with replacement, find the probability that all four individuals have hearing loss. Round your result to five decimal places.
b. If four individuals of the study are randomly selected with re- placement, find the probability that at least one of the individ uals has hearing loss. Round your result to five decimal places.