A sociology teacher asked his students to complete a survey at the beginning of the year. One survey question asked, "Do you consider yourself responsible?" Another question asked, "How many siblings do you have?" Irresponsible Responsible 0 siblings 1 or more siblings 4 4 3 7 What is the probability that a randomly selected student has 1 or more siblings given that the student is irresponsible? Simplify any fractions.