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

Find the sample variance of 3, 7, 8, 10, 12.

  1. 9.2
  2. 11.5
  3. 46
  4. 3.39

Answer

B. 11.5

Solution

Mean =8. Squared deviations: 25,1,0,4,16 sum to 46. Sample variance s2=46/5-1=11.5.

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