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?

Multiple Choice

• 10 and 25
• 20 and 25
• 10 and 24.5
• 20 and 24.5