## you have to write code below every line that starts with #. Lines that start with ##provide explanations
# clear the workspace
# load the star.csv data
# Create a scatter plot with math on the x-axis and reading on the y-axis, Make the scatter plot nice in the ways discussed in class.
# Use the abline function to add a vertical line at the mean of the math variable. Remember, there are missing values in that variable so be sure to use the na.rm = TRUE argument to drop them.
# Use the text function to add "Average Math Score" to the plot at the point x=640, y=540
# Add a horizontal line at the mean of the reading variable.
# Create a scatter plot with math on the x-axis and reading on the y-axis, but only for students where classtype is regular (plot those points in black). Make the scatter plot nice in the ways discussed in class
# add, in red, the points for students where classtype is small
# Add vertical lines at the means of the math variable for the students in a regular class (in black) and the students in a small class (in red).
# Add horizontal lines at the means of the reading variable for the students in a regular class (in black) and the students in a small class (in red).