A teacher notices that the morning of an exam, many of the students seem tired. He decides to ask all of his students how many hours they slept the night before. 1 slept 7 hours, 3 slept 6 hours, 5 slept 5 hours, 7 slept 4 hours, 8 slept 3 hours, 2 slept 2 hours, 1 slept for 1 hour, and 1 did not sleep at all.

What is the probability that student had 5 or fewer hours of sleep?