Definitions for "Lower Quartile"
The score of the student 'a quarter of the way from the bottom'. Three quarters of the students in a tariff table will score at least this; the other quarter will score no more than this.
the middle value (or average of the two middle values) in the set of values less than the median
(Q1) A value that exceeds the values for no more than one quarter of the individuals and is exceeded by the values of no more than three quarters of the individuals. cf.  upper quartile.
Keywords:  percentile, measures, set
(Q1), the 25th percentile of a set of measures.
Keywords:  greater, returns, group, point
The point at which 75% of all returns in a group are greater and 25% are lower.