A junior high principal runs a report to determine what ratio of all 100 students take the bus to school or are dropped off by parents, based on grade (seventh grade or eight grade). The results are shown in the following probability distribution table.
Grade vs.
Transportation Takes
Bus Parents
Drop off Total
Seventh Grader 0.44 0.12 0.56
Eighth Grader 0.11 0.33 0.44
Total 0.55 0.45 1
What is the probability that a student is in seventh grade, given that he/she is dropped off by parents?
0.27
0.38
0.22
0.73