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

r<=29 218 211.4 0.205 0.205
r=30 5173 5134.0 0.296 0.501
r=31 23002 23103.0 0.442 0.943
r=32 11607 11551.5 0.266 1.209

chi-square = 1.209 with df = 3; p-value = 0.751