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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
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Correct Answer: Option D
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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