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library(dplyr)
mtcars %>%
group_by(cyl) %>%
summarize(mean(disp))
# # A tibble: 3 × 2
# cyl `mean(disp)`
# <dbl> <dbl>
# 1 4 105.1364
# 2 6 183.3143
# 3 8 353.1000
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