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1

I found the answer and thank you!

2

As a beginner to R you may benefit from studying this useful book.
https://r4ds.had.co.nz/
Particularly chapter 5

3

Try this:

group_by(sex) %>%
filter(grade > 69) %>%

or

group_by(gender) %>%
filter(grade > 69) %>%

4

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