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Sample and population standard deviation

You have found the following ages (in years) of all 55 zebras at your local zoo:
8,11,17,7,19\qquad8,\enspace 11,\enspace 17,\enspace 7,\enspace 19
What is the average age of the zebras at your zoo? What is the standard deviation? Round your answers to the nearest tenth.
Average age:
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
years old
Standard deviation:
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
years