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

r<=21 233 210.9 2.307 2.307
r=22 5156 5135.9 0.079 2.386
r=23 23078 23103.6 0.028 2.414
r=24 11533 11549.5 0.024 2.438

chi-square = 2.438 with df = 3; p-value = 0.486642