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JAMB Economics 2018 Paper

Question : 54

Total: 85

X	8	10	12	16	18	20	24
F	2	1	4	3	3	1	6

From the table, Calculate the mean?

Solution:

Concept:

The mean of a frequency distribution is found by dividing the sum of the products of each value and its frequency by the total frequency.

Explanation:

Multiply each value of

X

by its frequency

F

8 \times 2 = 16

10 \times 1 = 10

12 \times 4 = 48

16 \times 3 = 48

18 \times 3 = 54

20 \times 1 = 20

24 \times 6 = 144

Add these products:

\sum FX = 16 + 10 + 48 + 48 + 54 + 20 + 144 = 340

Add the frequencies:

\sum F = 2 + 1 + 4 + 3 + 3 + 1 + 6 = 20

Apply the mean formula:

\text{Mean} = \frac{\sum FX}{\sum F} = \frac{340}{20} = 17.0

Answer:

17.0

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