##################################################
## HOMEWORK 2
## Intro to R Part 2: Packages and Functions
##
## Type your answer below each prompt.
##################################################

## Q1. Load the `maps` package into memory.



## Q2. The maps package comes with a dataset called `world.cities`. What kind of object is 'world.cities'?
  


## Q3. How many rows and columns does `world.cities` have?



## Q4. What is the original data source of world.cities?
##     Hint: datasets have help pages too!



## Q5. What is the average population of the world cities?



## Q6. How many world cities have a population larger than 500,000?




## Q7. The maps package also has a dataset called `us.cities`, which includes columns
## for longitude and latitude. Make a scatter plot of the longitude and latitude coordinates.



## Q8. Import the following CSV file as a data frame:<br/>https://raw.githubusercontent.com/ajlyons/rspatial_bgs23/main/notebooks/data/sf_libraries.csv
## How many libraries are there in San Francisco?



## Q09. Use `runif()` to generate 20 random numbers uniformly distributed between 100 and 200.



## Q10. Rewrite the following expression with pipes. You can use either the
## traditional pipe (`%>%`) from the magrittr package, or the more recent native
## pipe (`|>`)

sum(round(rnorm(n = 200, mean = 50, sd = 5)))