In Country X, a building is in Category A if it has a roof height of a

Official Explanation

The building with the greatest mean height per floor has a roof height between___________meters.

The building with the greatest mean height per floor is represented by the uppermost black square on the graph. The horizontal coordinate of this square indicates that the roof height of the building is between 350 and 370 meters.

The correct answer is 350 and 370.

There is a____________correlation between the number of floors and the mean height per floor.

Where the red circles are in the upper portions of the graph, the corresponding black squares are generally in the lower regions. Similarly, where the red circles are in the lower portions of the graph, the corresponding black squares are generally in the upper regions. This demonstrates a strong negative correlation between the variable represented by the vertical coordinates of the red circles and the variable represented by the vertical coordinates of the black squares. Thus there is a strong negative correlation between the number of floors and the mean height per floor.

The correct answer is strong negative.