Please answering the foloowing question, thank you!

Among a sample of 100 residents in NY, 25 have invested in stocks and 10 have invested in both stocks and houses. What is the probability that a person randomly selected from the sample have invested in houses but not in stocks? O It cannot be determined without additional information O 75% O 60% O 15% O 35% QUESTION 6 In answering a multiple-choice question, a student either knows the correct answer or guesses. Assume the (prior) probability that a student knows the correct answer is p = 0.5. Also assume that a student who guesses at the answer will be correct with probability 1/m, where m is the number of multiple-choice alternatives. If you want to ensure that the probability that a student knew the answer to a question given that he answered it correctly is at least 0. 75, how large must m be? O 2 0 3 )4 O 5 O We need more information to determine the correct