R-studio programing - data science

1. Use relative paths to load these data frames into R.

```{r, eval=TRUE}

2. These data are messy. The observational units in `fert`, `life`, and `pop` are locations in space-time (e.g. Aruba in 2017). Recall that tidy data should 

have one observational unit per row.

- Make these data tidy now.

- Make sure the new year variable is a numeric.

{r, eval = TRUE}

3. Combine these data frames so the fertility rate, population, life expectancy, and the region for each country in each year are in a single data frame.

{r, eval = TRUE}

Sample Solution