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Use ggplot2 package to make plot of average length of lanes (lane_avg_length; y-axis) for each year (dateInstalled; x-axis). You can use lines layer (+ geom_line()) or points layer (+ geom_point()), or both!
add bike <- read_csv(file = "http://jhudatascience.org/intro_to_r/data/Bike_Lanes.csv") to the lab for data viz for folks who can't get jhur
maybe rearrange the slides that have to do with theme() till later
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