| 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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