Test Index

JAMB Mathematics 2010 Paper

© africaexams.com

Question : 20

Total: 49

Marks	1	2	3	4	5
Frequency	2	2	8	4	4

The table above show the marks obtained in a given test.

Find the mean mark

3.1
3.0
3.2
3.3

Solution:

Concept:

The mean of a frequency distribution is calculated by dividing the sum of each mark multiplied by its frequency by the total frequency.

Explanation:

Let

x

be the mark and

f

be its frequency.

Multiply each mark by its frequency:

1 \times 2 = 2

2 \times 2 = 4

3 \times 8 = 24

4 \times 4 = 16

5 \times 4 = 20

Total frequency:

\sum f = 2 + 2 + 8 + 4 + 4 = 20

Sum of

fx

:

\sum fx = 2 + 4 + 24 + 16 + 20 = 66

Mean

= \frac{\sum fx}{\sum f} = \frac{66}{20} = 3.3

Answer:

The mean mark is

3.3

, which is option D.

© africaexams.com

Go to Question:

Prev Question

Next Question