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 percent difference between the first (2.50 MPa) and the last (2.56 MPa) measurements.

Answer 1

The percent difference is

$$\epsilon=\frac{2.56-2.50}{2.50}·100\%=2\%.$$