Using mutate to change or create a column

Suppose we want life expectancy to be measured in months instead of years: you'd have to multiply the existing value by 12. You can use the mutate() verb to change this column, or to create a new column that's calculated this way.

Instructions

100 XP

Use mutate() to change the existing lifeExp column, by multiplying it by 12: 12 * lifeExp.
Use mutate() to add a new column, called lifeExpMonths, calculated as 12 * lifeExp.

Take Hint (-30 XP)