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Exercise

Combining filter, mutate, and arrange

In this exercise, you'll combine all three of the verbs you've learned in this chapter, to find the countries with the highest life expectancy, in months, in the year 2007.

Instructions

100 XP
  • In one sequence of pipes on the gapminder dataset:
  • filter() for observations from the year 2007,
  • mutate() to create a column lifeExpMonths, calculated as 12 * lifeExp, and
  • arrange() in descending order of that new column