Homework-4: dplyr summarise

The goal of this homework is to learn using dplyr summarise function.

1. Open this repository in RStudio Cloud or clone to your local RStudio.

2. Complete the exercises in index.Rmd file.

3. Knit .Rmd file to .md file.

4. Commit all your work/files and push completed homework to Github.

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Tutorial how to get repo/project from Github to your workspace: https://github.com/rstats-tln/fork-and-clone-repo

More resources at https://happygitwithr.com/.