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WAEC Mathematics

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

Since the average of the numbers is 4, (1+3+5+7+x)÷5=4(1 + 3 + 5 + 7 + x)÷5=4. After simplifying, you get

(16+x)÷5=416+x=20x=4(16 + x)÷5=4 \\ \\ 16 + x = 20 \\ x=4
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