It is the lower quartile.
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The median is the midpoint of the data set. So half the observations are greater than the median and half are smaller.
The lower quartile.
It is the upper quartile.
A lower quartile i s the mediaon of the lower half of a data set. A data set is divided up into different quartiles.
The middle value so half the data is above it and half the data is below it. It is often used because extreme values tend to affect it less than other measures of central tendency. If you have an even number of data points, the median is the mean of those two points. ( So you add the two values and divided by two)