Find the mean of the following frequency distribution:

Class interval: 0-8 8-16 16-24 24-32 32-40
Frequency: $5$ $6$ $4$ $3$ $2$

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Solution

Answer:-
Class interval Frequency $x_{i}$ $f_{i} x_{i}$
0-8 5 4 20
8-16 6 12 72
16-24 4 20 80
24-32 3 28 84
32-40 2 36 72
$Σ f_{i} = 20$ $Σ f_{i} x_{i} = 328$
$m e a n = \frac{Σ f_{i} x_{i}}{Σ f_{i}} = \frac{328}{20} = 16.4$

Suggest Corrections

Class interval:	0−8	8−16	16−24	24−32	32−40
Frequency:	5	9	10	8	8

Size of items:	0-4	4-8	8-12	12-16	16-20	20-24	24-28	28-32	32-36	36-40
Frequency:	5	7	9	17	12	10	6	3	1	0

Class interval:	0-6	6-12	12-18	18-24	24-30
Frequency:	6	8	10	9	7

Class interval:	0-8	8-16	16-24	24-32	32-40
Frequency:	$5$	$6$	$4$	$3$	$2$