Of the 73 students enrolled in a statistics class last semester, 34 worked during the semester and 37 received a high grade. Report answers accurate to 4 decimal places. If two students were selected from the class, one after the other and without replacement, what is the probability that: a. the second student received a high grade given the first student also did? b. both students worked during the semester? c. only the second student worked during the semester (the first student did not)? d. neither of the two students received a high grade