2) The normal distribution function is defined as follows. f(x)=21e22(x)2 Accordingly, a) Write a MATLAB function file that has two inputs, the arithmetic mean and the standard deviation . This function will be used to plot the normal distribution curve for the x-range [3,+3] b) Use this function in a script file (or in the command window) to plot 3 different normal distributions with different arithmetic mean and standard deviation values on the same figure (you can also use the subplot function if you like). Please properly label the x - and y-axes