Practice calculating both sample and population variances.

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 variance?
Round your answers to the nearest tenth.
Average age:
space
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i
years old
Variance:
space
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i
yearsstart superscript, 2, end superscript
Get 3 answers correct in a row