A medicine works 3 out of 4 times to alleviate allergy symptoms in patients. In a trial, 2 patients are chosen at random. Which simulation can be used to estimate the probability that the medicine will alleviate allergy symptoms in either or both patients?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)