R Beginner Quiz 5

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Quiz 5
1. How do you select rows where 'age' > 20?
2. Which function computes the sum of a vector?
3. How to check for missing values?
4. Which function sorts a vector?
5. Which function computes the standard deviation?
6. How to create a data frame?
7. Which function calculates variance?
8. Which function returns the working directory?
9. How do you comment out multiple lines?
10. What function lists all objects in the environment?
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