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Smoothing Histograms Using ggplot

The figure below contrasts a histogram with a smoothed histogram using the ggplot function. To enhance the visualization, we made the histogram semi-transparent using the alpha argument (which takes a value between 0 and 1 indicating the transparency level):

ggplot(faithful, aes(x = waiting, y = ..density..)) +
geom_histogram(alpha = 0.3, bins = 30) +
geom_density(size = 1.5, color = "red")
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