Knee replacement surgery

age in years : 18 to 44 45 to 64 65 to 74 75 to 84 85 and older Probability: 0.028 0.246 0.433 0.267 0.029 9. The probability is 0.28 that a randomly selected student from Dr. Rossman's course is a sophomore. This means that ______% of Dr. Rossman's students must be sophomores. 10. If 72% of Dr. Garfield's students earn passing grades in her algebra course, the probability that a randomly chosen student from Dr. Garfield's course will earn a passing grade must be equal to what value?