Test Index

JAMB Economics 2018 Paper

Question : 64

Total: 85

X	2	3	4	5
F	2	5	2	1

From the table, the mean of the distribution is___________

Solution:

Concept:

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

Explanation:

Mean is given by:

\text{Mean} = \frac{\sum fx}{\sum f}

First, multiply each

X

by its frequency

F

2 \times 2 = 4

3 \times 5 = 15

4 \times 2 = 8

5 \times 1 = 5

Sum of

fx

4 + 15 + 8 + 5 = 32

Sum of frequencies:

2 + 5 + 2 + 1 = 10

Mean

= \frac{32}{10} = 3.2

Answer:

C. 3.2

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