'How can I plot the mean of a feature in a barplot?

I have followed barplot example:

library(ggplot2)
df <- read.csv("https://raw.githubusercontent.com/plotly/datasets/master/violin_data.csv")

g <- ggplot(df, mapping = aes(forcats::fct_infreq(sex), fill = as.factor(size))) +
  geom_bar(colour = "white") + coord_flip() + 
  geom_text(aes(label = paste0("n=", ..count..)), stat='count', 
            position = position_stack(vjust = 0.5))
g

Which gives me:

What I want is the mean of the size from the Female and the Male:

r ggplot2

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'How can I plot the mean of a feature in a barplot?

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