Graphs 1 compare the distribution of carcasses by on line grading classification on one side, with a
“standard” population of the same average and coefficient of variation (C.V.) on the other side. One
can see that the on line grading curve shifts to the left. The median (separates the on line grading
weights of the flock into 2 identical sized sub-populations) is clearly inferior to the average (the sum of
the weights divided by the total number of broilers). This characteristic is well known to slaughterhouse
managers.