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.

The lower quartile is the 25th percentile.