Problem 2: Attachment 2 shows the data from experimental testing of concrete prism under flexural load. From the experimental results: a) Plot the graph of Flexural Strength vs Deflection. Group 1: Normal concrete (Density 2400) - Flexural Strength (kN) vs Deflection (mm). b) Energy of concrete can be calculated by finding the area under the graph. Therefore, evaluate the energy of the concrete by using two (2) methods: i. Portioning the area under the graph and manually calculating the area of each portion. ii. From the graph, add a trendline of the polynomial to get an approximate function and integrate the function to get the area under the graph. ) Compare and justify the value from both methods. https://drive.google.com/drive/folders/1mRZhzBiHubmvjIzi9VnhM1- IvxxN-cA7?usp=sharing excel attachment in this link