Bar Plot

A bar plot can easily be obtain in R using the command "barplot" in the base  package "graphics"

> Degree=c(27859,58007,44465,44828)         # Degree is a vector containing the number of adults interviewed corresponding
                                             to their educational level 
>barplot(Degree, xlab="Level of Education", ylab="Number of adults",
names.arg=c("Not HS grad","HS grad","Some college","College grad"),col=rainbow(4))    # Obtaining the barplot


Going further:

Check with help(barplot) all the options of this command.