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

r<=29 210 211.4 0.010 0.010
r=30 5180 5134.0 0.412 0.421
r=31 23092 23103.0 0.005 0.427
r=32 11518 11551.5 0.097 0.524

chi-square = 0.524 with df = 3; p-value = 0.914