# Sample and population standard deviation

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### Problem

You have found the following ages (in years) of all 4 gorillas at your local zoo:
space, 7, comma, space, 10, comma, space, 15, comma, space, 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:
space
years old
Standard deviation:
space
years