Question

determine the class width of each class.
hourly wage at first job
class frequency
6.6–7.5 13
7.6–8.5 12
8.6–9.5 9
9.6–10.5 6
10.6–11.5 13

Explanation:

Step1: Pick class, subtract bounds

For class 6.6–7.5: $7.5 - 6.6 = 0.9$

Step2: Verify with another class

For class 7.6–8.5: $8.5 - 7.6 = 0.9$

Answer:

0.9