A jar contains black and white marbles. Two marbles are chosen without replacement. The probability of selecting a black marble and then a white marble is 0.34, and the probability of selecting a black marble on the first draw is 0.47. What is the probability of selecting a white marble on the second draw, given that the first marble drawn was black? Solution: P(White|Black) ??=?? P(Black and White) ??=?? 0.34 ??=?? 0.72 ??=?? 72% ?? P(black) The probability that it is Friday and that a student is absent is 0.03. Since there are 5 school days in a week, the probability that it is Friday is 0.2. What is the probability that a student is absent given that today is Friday? Solution:?? P(Absent|Friday) ??=?? P(Friday and Absent) ??=?? 0.03 ??=?? 0.15 ??=??