Chapter 10 The dplyr package Quiz (week 6)
10.1 starwars data
A starwars is a tibble in dplyr containing 13 variables about the features of 13 characters in the movie.
## # A tibble: 87 x 14
## name height mass hair_color skin_color eye_color birth_year sex gender
## <chr> <int> <dbl> <chr> <chr> <chr> <dbl> <chr> <chr>
## 1 Luke~ 172 77 blond fair blue 19 male mascu~
## 2 C-3PO 167 75 <NA> gold yellow 112 none mascu~
## 3 R2-D2 96 32 <NA> white, bl~ red 33 none mascu~
## 4 Dart~ 202 136 none white yellow 41.9 male mascu~
## 5 Leia~ 150 49 brown light brown 19 fema~ femin~
## 6 Owen~ 178 120 brown, gr~ light blue 52 male mascu~
## 7 Beru~ 165 75 brown light blue 47 fema~ femin~
## 8 R5-D4 97 32 <NA> white, red red NA none mascu~
## 9 Bigg~ 183 84 black light brown 24 male mascu~
## 10 Obi-~ 182 77 auburn, w~ fair blue-gray 57 male mascu~
## # ... with 77 more rows, and 5 more variables: homeworld <chr>, species <chr>,
## # films <list>, vehicles <list>, starships <list>## Rows: 87
## Columns: 14
## $ name <chr> "Luke Skywalker", "C-3PO", "R2-D2", "Darth Vader", "Leia...
## $ height <int> 172, 167, 96, 202, 150, 178, 165, 97, 183, 182, 188, 180...
## $ mass <dbl> 77.0, 75.0, 32.0, 136.0, 49.0, 120.0, 75.0, 32.0, 84.0, ...
## $ hair_color <chr> "blond", NA, NA, "none", "brown", "brown, grey", "brown"...
## $ skin_color <chr> "fair", "gold", "white, blue", "white", "light", "light"...
## $ eye_color <chr> "blue", "yellow", "red", "yellow", "brown", "blue", "blu...
## $ birth_year <dbl> 19.0, 112.0, 33.0, 41.9, 19.0, 52.0, 47.0, NA, 24.0, 57....
## $ sex <chr> "male", "none", "none", "male", "female", "male", "femal...
## $ gender <chr> "masculine", "masculine", "masculine", "masculine", "fem...
## $ homeworld <chr> "Tatooine", "Tatooine", "Naboo", "Tatooine", "Alderaan",...
## $ species <chr> "Human", "Droid", "Droid", "Human", "Human", "Human", "H...
## $ films <list> [<"The Empire Strikes Back", "Revenge of the Sith", "Re...
## $ vehicles <list> [<"Snowspeeder", "Imperial Speeder Bike">, <>, <>, <>, ...
## $ starships <list> [<"X-wing", "Imperial shuttle">, <>, <>, "TIE Advanced ...Problem1. How many humans are contained in starwars overall? (Hint. use count())
Problem 2. How many feminine humans are contained in starwars?
Problem3. From which homeworld do the most individuals come from?
Problem4. What is the mean height of all individuals with orange eyes from the most popular homeworld?
Problem5. What is the standard deviation of height for all droids.