For anyone curious about an update... in my stats classes today, we have (all CLV): n=1958, red=250, orange=399, yellow=261, green=426, blue=399, brown=223. So, green was a little high (95% C.I. does not capture .198, but 99% does). All others are pretty well in line. We are doing this as a confidence-interval activity, but a chi-square test yields p= about 0.33 for the CLV proportions.