2. a. In a programming computation, CSE students are classified into three groups, Group A, Group B and Group C. The following data show the number of students who has taken more than 21 minutes and less than 21 minutes to solve a particular problem. Group A Group B Group C More than 21 min 18 12 Less than 21 min 14 13 15 Suppose you pick a student from this sample. What is the probability that this student comes from group B? ii, If this student comes from Group B, what is the probability that this student will be one who takes less than 21 minutes? iii. What is the probability that this student will take more than 21 minutes and comes from group C? iv. What is the probability that this student will take more than 21 minutes or comes from group A? Check whether these two events are independent