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 standard deviation? Round your answers to the nearest tenth. **
Average age:
$\quad$ [[☃ numeric-input 1]] years old
Standard deviation:
$\quad$ [[☃ numeric-input 2]] years