How many samples of surfacing 6000 sq. ft.?

• A. 5
• B. 6
• C. 8
• D. 7

Answer: (D)

The main idea is that sampling scales with area: the total surface area is divided by the area that one sample represents, and you round up to ensure the whole surface is covered. In this testing plan, the standard assigns a fixed area that each sample should represent. When you apply that rule to 6000 square feet, the calculation yields seven samples to achieve adequate coverage across the entire surface. Taking fewer would leave parts of the surface under-tested and could miss variability in the finish, while more samples would go beyond what the standard requires. So seven samples provide the right balance of representativeness and efficiency for 6000 square feet.