The mean of 1, 3, 5, 7 and x is 4. Find the value of
MATHEMATICS
WAEC 2018
The mean of 1, 3, 5, 7 and x is 4. Find the value of x
- A. 2
- B. 4
- C. 6
- D. 8
Correct Answer: B. 4
Explanation
Mean = \(\frac{\sum x}{n}\)
4 = \(\frac{1 + 3 + 5 + 7 + x}{5}\)
4 x 5 = 16 + x
20 - 16 = x
4 = x
x = 4
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