A:2 Question 4 (15 marks) DO F:O A laboratory test on a concrete sample has measured the variation of the compressive strength, fck, with the curing time, t. Data are reported in Table 1. Table 1 Data of the laboratory test for Question 4 Curing time [day] Compressive Strength (MPa] 1 2 A+D 5 5 7 16+F 18 22+F 28 24+F 50 30+F (0) Given the model fck = a1 + a2 loget, determine the coefficients a, and a2 (6 marks) . Copy and paste your MATLAB code below: . Determine the value of the compressive strength at t=38 days by using the obtained formula, paste your result below: (4 marks) Plot below a figure showing both experimental data in Table 1 (scatter plot) and model curve (continuous curve): (5 marks) Module Code_SEM1_2021/2022 Page 6 of 9