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 has an A?
Slept more than 6 hours Slept 6 hours or less
Has an A 3 2
Does not have an A 5 12

Answer 1

Number with an A = 3 + 2 = 5. Total students = 3 + 2 + 5 + 12 = 22.

Probability = 5/22 ≈ 0.2273 = 22.73%.