The mean of 2, 5, (x + 2), 7 and 9 is 6. Find the
FURTHER MATHEMATICS
WAEC 2011
The mean of 2, 5, (x + 2), 7 and 9 is 6. Find the median.
- A. 5.5
- B. 6.0
- C. 6.5
- D. 7.0
Correct Answer: D. 7.0
Explanation
\(\frac{2 + 5+ (x + 2) + 7 + 9}{5} = 6 \implies 25 + x = 30\)
\(x = 5 \therefore x + 2 = 5 + 2 = 7\)
Arranging the numbers in ascending order: 2, 5, 7, 7, 9.
Median = 7.0
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