Post-UTME Mathematics 2013 Objective — Question 39
Question 39 of 100 from the Post-UTME Screening (Post-UTME) Mathematics 2013 Objective paper, with the correct answer and a full explanation.
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Find the standard deviation of the data using the table above (classes 1-3, 4-6, 7-9 with frequencies 5, 8, 5)
- A. 5
- B. 6
- C. 5/3
- D. √5Correct
Explanation
Using midpoints 2,5,8: mean=5, and Σf(x-mean)²/n = 90/18 = 5, so standard deviation = √5.
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