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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