According to an article in the American Heart Association's publication Circulation, 24% of patients who had been hospitalized for acute myocardial. Supposed there are 12 people who have been hospitalized for an acute myocardial infraction.

a) Find probability that all 12 filled their medication by seventh day following discharge

b) find probability that at least 7 of 12 did not fill their medication by seventh day following discharge

c) Fin probability that at least 3 of 12 did not fill their medication by seventh day following discharge