Which of the following statements are correct? a. the value of a function that is a solution to laplace's equation is equal to the average of the values at its nearest neighboring points. b. the solution to laplace's equation in some region in space achieves its maximum and minimum values on the boundary of the region. c. poisson's equation becomes laplace's equation in any region with no volume charge. d. laplace's equation is a second order partial differential equation.

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.