RANK OBSERVED EXPECTED (O-E)^2/E SUM

r<=21 199 210.9 0.676 0.676
r=22 5052 5135.9 1.371 2.046
r=23 23114 23103.6 0.005 2.051
r=24 11635 11549.5 0.633 2.684

chi-square = 2.684 with df = 3; p-value = 0.443008