Mathematics for IGCSE & O level - Statistical Diagrams (Section 4 - No. 10)
In a cumulative frequency diagram, how is the lower quartile determined?
Find the value on the x-axis corresponding to 25% of the total frequency.
Find the value on the x-axis corresponding to 50% of the total frequency.
Find the value on the x-axis corresponding to 75% of the total frequency.
Calculate the average of the minimum and median.
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The lower quartile is the 25th percentile.