A variable is normally distributed with mean 20 and standard deviation 9. Use your graphing calculator to find each of the following areas. Write your answers in decimal form. Round to the nearest thousandth as needed. a) Find the area to the left of 20. b) Find the area to the left of 13. c) Find the area to the right of 16. d) Find the area to the right of 29. e) Find the area between 13 and 30.