Aprofessor has noticed that even though attendance is not a component of the grade for his class, students who attend regularly obtain better grades. in fact, 40% of those who attend regularly receive as in the class, while only 10% of those who do not attend regularly receive as. about 70% of students attend class regularly. let events r = regularly and a = grade a. a) match the given percentages with symbols of events 10% 1. p(r) 40% 2. p(r and a) 70% 3. p(rc | a) 4. p(rc and a) 5. p(a | r) 6. p(a | rc) 7. p(r | a) b) the overall percentage who receive as is %.