R version 3.1.0 (2014-04-10) -- "Spring Dance"
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: i686-pc-linux-gnu (32-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> x <- c(3.5,3.1,3.1,2.4,4.5,3.0,3.0,3.0,3.5,3.3,4.0,2.5,3.7,2.7,3.2,3.0,3.0,3.9,3.4,3.1,3.4,3.0,3.0,3.5,3.5)
> par4 = 'Interval/Ratio'
> par3 = 'FALSE'
> par2 = 'grey'
> par1 = ''
> xlab = 'Weighted GPA'
> main = 'Weighted GPA's 25 Students'
Error: unexpected symbol in "main = 'Weighted GPA's"
Execution halted