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JAMB Mathematics 2013 Paper

Question : 23

Total: 47

Find the mean of t + 2, 2t - 4, 3t + 2 and 2t.

Solution:

Concept:

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

Explanation:

The given values are

t + 2

2t - 4

3t + 2

, and

2t

First, find the sum of the values:

(t + 2) + (2t - 4) + (3t + 2) + 2t

Combine like terms:

t + 2t + 3t + 2t = 8t

2 - 4 + 2 = 0

So the sum is

8t

The number of values is

N = 4

Mean

= \frac{\text{sum}}{N} = \frac{8t}{4} = 2t

Answer:

2t

(Option B)

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