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To find the probability that a student chosen randomly from the class slept 6 hours or less, you need to add up the number of students who slept 6 hours or less and divide it by the total number of students in the class.
The total number of students who slept 6 hours or less is 5 + 19 = 24.
The total number of students in the class is 4 + 5 + 2 + 19 = 30.
Therefore, the probability that a student chosen randomly from the class slept 6 hours or less is 24/30 = 0.8 or 80%.