A group of middle school students in your town were surveyed and classified according to grade level and what mode of transportation they use to get to school. The results are shown in the two-way frequency table below. Walk Bus Car Total 6th grade 30 120 65 215 7th grade 25 170 25 220 8th grade 40 130 41 211 Total 95 420 131 646 Question 1 0 / 3 pts If a student is chosen at random from this group, what is the probability that he or she is a 6th grade student and takes the bus, P(6th grade and bus)?