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

r<=29 212 211.4 0.002 0.002
r=30 5270 5134.0 3.602 3.604
r=31 23001 23103.0 0.451 4.054
r=32 11517 11551.5 0.103 4.158

chi-square = 4.158 with df = 3; p-value = 0.245