You have found the following ages (in years) of all $4$ gorillas at your local zoo:
$\qquad7,\enspace 10,\enspace 15,\enspace 21$
** What is the average age of the gorillas at your zoo? What is the variance?**
*Round your answers to the nearest tenth.*
Average age:
$\quad$ [[☃ math-keypad 1]] years old
Variance:
$\quad$ [[☃ math-keypad 2]] years$^2$