Question

For a certain class, the following data table summarizes the amount of sleep of students and whether or not they have an A in the class. What is the probability that a student chosen randomly from the class slept 6 hours or less?
Slept more than 6 hours Slept 6 hours or less
Has an A 6 7
Does not have an A 5 8

Answer 1

There are 7 + 8 = 15 students who slept 6 hours or less, out of 6+7+5+8 = 26 total students.

Probability = 15/26 ≈ 0.577 (about 57.7%).