During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil. Liquid limit tests: Moisture content(%) 38.4 36.5 33.1 270 Number of blows, N 14 16 20 28 Plastic limit tests: Students conducted two trials and found that PL = 122% for the first trial and PL = 178% for the second trial. a. Draw the flow curve and obtain the liquid limit. b. What is the plasticity index of the soil? Use an average value of PL rom the two plastic limit trails. 4.2 Refer to the soil in Problem 4.1. A second group of students conducted only one test and found that the groove on the soil sample closed 12.5 mm W N = 21 and w = 30.4%. Estimate the liquid limit by the one-point method.