Part 3. Total area under curve (short answer; 4 points) (1 point for each correct answer) 3a. What is the total area under the curve of the distribution N(5,7)? 3b. What is the total area under the curve of the distribution N(10,3)? 3c. What is the total area under the curve of the distribution N(1,1)? 3d. What is the total area under the curve of the distribution N(4.7,0.62)