Diameter of circular metal disk
WASHER
A data frame with 20 observations on the following variable:
diameter
(diameter of washer in cm)
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.
ggplot(data = WASHER, aes(x = diameter)) + geom_density(fill = "blue", alpha = 0.2)