5) All math 120 students one semester were asked how many hours each had spent reviewing the course material before the final exam. The results are given below: Number of hours, x 4 5 6 7 8 P(X = X) 0.1 ? 0.2 0.15 0.3 Determine the population expected value and the standard deviation of the number of hours that students spent reviewing the course material before the final exam. a u = 6.5 b) u = 6.3 c) u = 1.38 d) u = 6 e.) u = 6 0 = 1.4 0 = 1.38 0 = 6.3 6 = 1.58 6 = 1.41