Normal Distributions (Plot) Write a script that will draw a graph of the standard normal distribution. Do not use the built-in function normal pdf (), that is, write the mathematical formula to define the height of the density function: f(x) = 1 2 1. To begin, define a vector of x values from -3 to 3 with an increment of 0.01. 2. Next, define a vector y using the functions sqrt(), pi(), and exp(). Hint: Use .^2 for the exponent. 3. Finally, use the function plot() to draw the graph.