Assuming a computer is available, plot the pdfs of the random variables defined in parts (a)–(d) of the last exercise. Obtain an overlay plot of all four pdfs also. In R the domain values of the pdfs can easily be obtained by using the seq command. For instance, the command x<-seq(-6,6,.1) returns a vector of values between −6 and 6 in jumps of 0.1.