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

r<=29 233 211.4 2.203 2.203
r=30 5159 5134.0 0.122 2.325
r=31 23012 23103.0 0.359 2.684
r=32 11596 11551.5 0.171 2.855

chi-square = 2.855 with df = 3; p-value = 0.415