DIRECTIONS for questions: The percentage distribution of households by…

Concept: To describe how a value changes across an ordered series of categories, compare each value with the one immediately before it. If every step rises, the value increases; if every step falls, it decreases; if every value is identical, it remains constant; if the direction of change reverses at least once (a fall followed by a rise, or a rise followed by a fall), the value is fluctuating.

1. From 'Below 15,000' to '15,000-50,000', the average household size changes from 4.75 to 4.50 — a decrease.

2. From '15,000-50,000' to '50,001-Above', the average household size changes from 4.50 to 4.70 — an increase.

Cross-check: The three values 4.75, 4.50 and 4.70 are all different, so the size does not remain constant; it does not rise at every step (ruling out 'Increases'), and it does not fall at every step (ruling out 'Decreases'). A decrease followed by an increase matches only the fluctuating pattern.

Hence, as the urban population of towns increases, the average household size fluctuates.