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.
(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.
The bottom quartile of any table (bottom 25%), when put in order of any selected scale of value, from highest to lowest; or the quarter of the population in any distribution with the lowest values of any selected attribute.