Question on: JAMB Economics - 2001
If the arithmetic mean of 1,2,3,4,5,6,x, 16 and 18 is 8.0, find the value of x?
A
7.0
B
6.0
C
8.5
D
8.0
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Correct Option: A
The arithmetic mean is calculated by summing all the numbers and dividing by the count of numbers.
1. **Set up the equation:** (1 + 2 + 3 + 4 + 5 + 6 + x + 16 + 18) / 9 = 8
2. **Simplify the equation:** (55 + x) / 9 = 8
3. **Multiply both sides by 9:** 55 + x = 72
4. **Solve for x:** x = 72 - 55
5. **Calculate x:** x = 17
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