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

r<=29 1490 211.4 7732.416 7732.416
r=30 15350 5134.0 20328.443 28060.858
r=31 23160 23103.0 0.140 28060.999
r=32 0 11551.5 11551.524 39612.523

chi-square = 39612.523 with df = 3; p-value = 0.000