NECO Mathematics 2007 Objective — Question 52
Question 52 of 60 from the National Examinations Council (NECO) Mathematics 2007 Objective paper, with the correct answer and a full explanation.
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Calculate the mean of the distribution in Table 3.2 (Class intervals 0-4,5-9,10-14,15-19 with frequencies 4,5,6,7).
- A. 7.6
- B. 8.6
- C. 10.6Correct
Explanation
Using midpoints 2,7,12,17 with frequencies 4,5,6,7: Sum(fx)=8+35+72+119=234. Sum(f)=22. Mean=234/22~=10.6.
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