Economics
JAMB 2001
If the arithmetic mean of 1,2,3,4,5,6,x, 16 and 18 is 8.0, find the value of x?
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A.
7.0
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B.
6.0
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C.
8.5
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D.
17.0
Correct Answer: Option D
Explanation
8 x \(\frac{55 + x}{9}\)
cross multiply
9 x 8 = 55 + x
72 - 55 = 17
x = 17
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