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

r<=21 214 210.9 0.044 0.044
r=22 5133 5135.9 0.002 0.046
r=23 23258 23103.6 1.031 1.077
r=24 11395 11549.5 2.067 3.145

chi-square = 3.145 with df = 3; p-value = 0.369833