You must write an exam question that asks students to compute a meaningful aggregate for a ratio-level dataset. Which candidate dataset and prompt best meet that requirement?

Dataset of survey ranks 1–10 for course topics; prompt: take the product of ranks across students and interpret the multiplicative average as the central ranking for the class.

Dataset of preferred study methods labeled A–D; prompt: compute the arithmetic mean of labels to find central tendency and argue whether dividing by four is meaningful.

Dataset of birth months listed by name January–December; prompt: subtract month numbers to interpret developmental differences and then compute geometric means to summarise seasonality.

Dataset of distances run by athletes in meters (0, 400, 800, 1500); prompt: calculate mean and interpret whether a runner who ran 800 m ran twice as far as one who ran 400 m.