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

r<=29 220 211.4 0.348 0.348
r=30 5081 5134.0 0.547 0.896
r=31 23105 23103.0 0.000 0.896
r=32 11594 11551.5 0.156 1.052

chi-square = 1.052 with df = 3; p-value = 0.789