Mathematics for IGCSE & O level - Statistical Diagrams (Section 1 - No. 43)

In a cumulative frequency diagram, how is the upper quartile found?

By finding the x-axis value corresponding to the 25th percentile.

By finding the x-axis value corresponding to the 75th percentile.

By finding the mean of the data.

By finding the median value.

The upper quartile is at the 75th percentile.