Post-UTME Mathematics 2018 Objective — Question 9
Question 9 of 20 from the Post-UTME Screening (Post-UTME) Mathematics 2018 Objective paper, with the correct answer and a full explanation.
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Find the variance of 3, 5, 7, 9, 11.
- A. 2*sqrt(2)
- B. 2.4
- C. 7
- D. 8Correct
Explanation
Mean = 35/5 = 7. Deviations: -4,-2,0,2,4. Squared: 16,4,0,4,16, sum=40. Variance = 40/5 = 8.
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