The numbers of boys and girls in each of the four classes of a high school are shown in the bar graph. if two students from the high school are chosen at random, one after the other, to represent the school at a leadership conference, what is the probability that the second student chosen is a sophomore girl given that the first student chosen was a senior boy? a) 200 1449 b) 25 483 c) 3 29 d) 50 483