Nothing
# Figure 6.4-1
xyplot(dbinom(0:18,27,0.25) ~ 0:18, groups=0:18 %in% 7,
type='h', lwd=8, lty=1)
histochart(dbinom(0:18,27,0.25) ~ 0:18, groups=0:18 %in% 7)
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