Lower Quartile Math Definition. The values that divide a list of numbers into quarters. The median divides a data set into two equal parts.
When we re dividing a set of data into quartiles we re doing the same thing as dividing a dollar into four quarters. Upper quartile or 75th percentile the median of the upper half of the data. Illustrated definition of quartiles.
Lower quartile the median of the data to the left of the median assuming the data are listed from least value to greatest value.
The 25th percentile is also called the first or lower quartile q 1. The second quartile q2 is also the median. Illustrated definition of quartiles. Upper quartile or 75th percentile the median of the upper half of the data.
