Author note — to cover

Calculate the mean from an ungrouped frequency table: build the value-times-frequency column, divide the fx total by the total frequency, and confront dividing by the number of rows as the classic error. Discrete data, exact answers. Grouped means are estimates on Estimating the mean; the median from a table is the sibling page. Both tiers. (S4)

• Fluency — direct questions on the mean from a frequency table, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).