Test Index

BECE Mathematics 2021 Paper

Question : 31

Total: 40

5,6,7

x

x

Solution:

Concept:

Average is the sum of all observations divided by the total number of observations.

Explanation:

The given numbers are

5

6

7

and

x

So the number of observations is

4

Sum of the numbers

= 5 + 6 + 7 + x = 18 + x

The average is given as

8

Therefore,

\frac{18 + x}{4} = 8

Multiply both sides by

4

18 + x = 32

Subtract

18

from both sides:

x = 14

Answer:

x = 14

Option B.

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