Refer to the following ages (rounded to the nearest whole year) of employees at a large company that were grouped into a distribution with class limits: 20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
What is the class interval and the midpoint of the first class?
A) 20 and 25
B) 20 and 24.5
C) 10 and 25
D) 10 and 24.5

Question

Quizplus · Accepted Answer

The class interval is the difference between the upper limit of one class and the lower limit of the same class, which is 30 - 20 = 10. The midpoint of the first class is the average of its upper and lower limits, which is (20 + 30) / 2 = 25.

Refer to the Following Ages (Rounded to the Nearest Whole