# Cumulative Frequency Diagrams & Box Plots

Cumulative Frequency Diagrams & Box Plots Cumulative Frequency Time t minutes 0t<5 5t<10 10t<15 15t<20 20t<25 Number of students 10 16 30 22 2 Cumulative Frequency 10 26 56 78 80 80 x x Cum freq 60 x Median = Middle Value 40

QUARTILES Lower Quartile = way Upper Quartile = way x 20 x 5 8 10 Interquartile Range 12 15 15 20 = 15 - 8 = 7 mins 25

t mins Box Plot Lowest value Lower Quartile 0 Highest value Median 5 10 Upper Quartile 15 20 25 t mins

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