Checkpoint: counting and choosing

Cumulative frequencies are 6, 15, 27 and 40. Which class is the median class?

• The third class
• The fourth class
• The second class

The median class is 20-30. Here n = 40, cf = 12 and f = 10. What is the median?

• 8
• 25
• 28

Modal class 20-30 has f₁ = 12. Also f₀ = 8, f₂ = 6 and h = 10. What is the mode?

• 26
• 25
• 24

A village has a few very rich families. Which average shows a typical family best?

• The total
• The mean
• The median

Cumulative frequencies are 4, 10, 18, 28 and 40. How many readings are below the upper bound of the third class?

• 28
• 18
• 8