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JAMB - Mathematics (2016 - No. 2)
If the mean of 4, y, 8 and 10 is 7. Find Y?
6
10
7
9
Forklaring
\(\frac{4 + y + 8 + 10}{4}\) = 7
22 + y = 4 x 7
22 + y = 28
y = 28 - 22 = 6
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