On weight data from : http://www.cs.helsinki.fi/u/hendry/work/stats1/Sheet.csv or: http://www.cs.helsinki.fi/u/hendry/work/stats1/R.tar

brk <- c(40,50,60,70,80,90,100)

barplot(t(table(cut(zz$x9, brk, right=F))))

http://bayes.math.montana.edu/Rweb/Rweb.general.html

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