From this curve the Upper quartile = 34 marks The interquartile range is an appropriate measure of dispersion Box Plots The full name for a box plot is a Box and Whisker plot. A correctly drawn box plot consists of five points. The box plot is used to show the measure of average (median) and the measure if dispersion (range of data, particularly the middle 50%) Example In a Mathematics exam, the students sat two papers Paper 1, the calculator paper, and Paper 2, the non-calculator paper. Each paper was marked out of 70.
From this curve the Upper quartile = 34 marks The interquartile range is an appropriate measure of dispersion Box Plots The full name for a box plot is a Box and Whisker plot. A correctly drawn box plot consists of five points. The box plot is used to show the measure of average (median) and the measure if dispersion (range of data, particularly the middle 50%) Example In a Mathematics exam, the students sat two papers Paper 1, the calculator paper, and Paper 2, the non-calculator paper. Each paper was marked out of 70.