Tuesday 16 January 2018

STATISTICS 1


In Kiswahili test the following marks were recorded.


marks
10-19
20-29
30-39
40-49
50-59
60-69
No. of students
3
7
14
8
5
3


Calculate the mean.

Solution

Here you are required to produce the frequency distribution table.



Class interval
Class mark (x)
Frequency(f)
fx
10-19.
14.5
3
43.5
20-29
24.5
7
171.5
30-39
34.5
14
483
40-49
44.5
8
356
50-59
54.5
5
272.5
60-69
64.5
3
193.5

∑f = 40
∑fx = 1520



Mean = ∑fx
              ∑f

Mean = 1520
               40

Mean =  38
         

Hence Mean =  38


TRY THIS...................


In a Biology test the following marks were recorded.


marks
10-14
15-19
20-24
25-29
30-34
35-39
No. of students
4
7
12
8
5
4



Calculate the mean.




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ALSO READ Form IV Quizzes   
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