Engineering Board Exam Reviewer · Mean, Variance, and Standard Deviation · medium

Find the population standard deviation of 2, 4, 4, 4, 5, 5, 7, 9.

  1. 2
  2. 2.14
  3. 4
  4. 2.83

Answer

A. 2

Solution

Mean =40/8=5. Squared deviations: 9,1,1,1,0,0,4,16 sum to 32. 2=32/8=4 and =2.

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