I have a table with students versus non-students. 3 students get less than or equal to 6 hours of sleep every night. 3 non-students get less than or equal to 6 hours of sleep every night. 3 students get greater than 6 hours of sleep every night and 1 non-student gets greater than 6 hours of sleep every night. what is the probability that a randomly selected person slept less than 6 hours of sleep per night