I need help with these questions

5. (10 points) At a large university, the Statistics Department has tried a different text during each of the last three quarters. During the fall quarter, 800 students used a book by Professor Mean; during the winter quarter, 500 students used a book by Professor Median; and during the spring quarter, 400 students used a book by Professor Mode. A survey at the end of each quarter showed that 700 students were satisfied with the text in the fall, 450 in the winter, and 580 in the spring, respectively. 400 300 (a) (7 points) If a student who took statistics during one of these three quarters is selected at random, what is the probability that the student is satisfied with the textbook? Female (b) (3 points) If a randomly selected student reports being satisfied with the book, what is the probability that the student used the book by Mean