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

r<=28 9054 211.4 369841.988 369841.988
r=29 30946 5134.0 129773.554 499615.541
r=30 0 23103.0 23103.048 522718.589
r=31 0 11551.5 11551.524 534270.113

chi-square = 534270.113 with df = 3; p-value = 0.000