could someone please help with these three? I got a few minutes left and I'm clueless IM IN NEED OF HELP!!



Answer:
Student 1 has the correct answer
Student 2 started of OK but then divides the number of white marbles by the number of non-white marbles, which is incorrect.
Student 3 reports a probability larger than 1 which is impossible. Also the answer is not in percentages.