Question: Representative data on x = carbonation depth (in millimeters) and y = strength (in mega pascals) for a sample of concrete core specimens taken from

Representative data on x = carbonation depth (in millimeters) and y = strength (in mega pascals) for a sample of concrete core specimens taken from a particular building were read from a plot in the article “The Carbonation of Concrete Structures in the Tropical Environment of Singapore” (Magazine of Concrete Research [1996]: 293-300);

Depth, x 8 20 20 30 35 40 50 55 65

Strength, y 22.8 17.1 21.1 16.1 13.4 12.4 11.4 9.7 6.8

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