Simple: New to R, seek some advice

See the FAQ: How to do a minimal reproducible example reprex for beginners for when looking for more specific answers.

Using the built-in mtcars data

sum(mtcars$carb == 3)
#> [1] 3
median(mtcars[which(mtcars$carb == 3),"mpg"])
#> [1] 16.4

The second example is an exemplary pattern for the second and third questions.

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