In a class of students, the following data table summarizes the amount of sleep of students and whether they have an A in the class. What is the probability that a student chosen randomly from the class slept 6 hours or less?

Question

Slept more than 6 hours Slept 6 hours or less
Has an A 4 5
Does not have an A 2 19

Answer 1

To find the probability that a randomly chosen student slept 6 hours or less, we need to add up the number of students who slept 6 hours or less and divide by the total number of students.

Number of students who slept 6 hours or less = 5 + 19 = 24
Total number of students = 4 + 5 + 2 + 19 = 30

Probability = Number of students who slept 6 hours or less / Total number of students
Probability = 24 / 30
Probability = 0.8 or 80%