Upper Quartile. So now we have enough data for the box and whisker plot. Just as the first quartile is known as the lower quartile the third quartile q3 is known as upper quartile.
The formula for calculating the upper quartile is q3 n 1. In this case all the quartiles are between numbers. Quartile 2 q2 10 11 2 10 5.
Upper quartile or 75th percentile the median of the upper half of the data.
The following figure shows the median quartiles and interquartile range. Upper quartile or 75th percentile the median of the upper half of the data. The upper quartile is the top 25 percent of numbers in the data set or the 75th percentile. Q3 q1 15 4 11.
