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JAMB Mathematics 2016 Paper

Question : 2

Total: 50

If the mean of 4, y, 8 and 10 is 7. Find Y?

Solution:

Concept:

The mean of a set of values is the sum of all values divided by the number of values.

Explanation:

The given values are

4

y

8

, and

10

There are

4

values, so the mean is written as:

\frac{4 + y + 8 + 10}{4} = 7

Add the known numbers:

4 + 8 + 10 = 22

So the equation becomes:

\frac{22 + y}{4} = 7

Multiply both sides by

4

to remove the denominator:

22 + y = 28

Subtract

22

from both sides:

y = 28 - 22 = 6

Therefore, the correct value of

y

6

Answer:

Option A:

6

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