Question

Data on the compressive strength of a concrete block after testing are as follows: 2.50 MPa, 2.55 MPa, 2.52 MPa, 2.51 MPa, and 2.56 MPa. Find the compressive strength of the concrete block.

Answer 1

As we established in the previous problems, the average value is 2.53 MPa, the absolute uncertainty is 0.02 MPa, so , the compressive strength is

$$\sigma=(2.53\pm0.02)\text{ MPa}$$