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

r<=29 179 211.4 4.971 4.971
r=30 5167 5134.0 0.212 5.183
r=31 23076 23103.0 0.032 5.214
r=32 11578 11551.5 0.061 5.275

chi-square = 5.275 with df = 3; p-value = 0.153