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

r<=29 1488 211.4 7708.244 7708.244
r=30 15299 5134.0 20125.983 27834.227
r=31 23213 23103.0 0.523 27834.750
r=32 0 11551.5 11551.524 39386.274

chi-square = 39386.274 with df = 3; p-value = 0.000