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Update exercise 2 section 3.2.4 (#511) 

Did you mean `mpg` instead of `mtcars`?
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RomeroBarata 2017-05-03 09:58:35 -03:00 committed by Hadley Wickham
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visualize.Rmd
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@ -84,7 +84,7 @@ The rest of this chapter will show you how to complete and extend this template
1. Run `ggplot(data = mpg)` what do you see?
1. How many rows are in `mtcars`? How many columns?
1. How many rows are in `mpg`? How many columns?
1. What does the `drv` variable describe? Read the help for `?mpg` to find
out.