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Find the mean of the following:

written 5.2 years ago by teamques10 ★ 68k

•   modified 5.2 years ago

C.I	0-10	10-20	20-30	30-40	40-50
frequency	3	5	8	3	1

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written 5.2 years ago by teamques10 ★ 68k

Solution:

C.I	$x_{i}$	$f_{i}$	$f_{I}x_{i}$
0-10	5	3	15
10-20	15	5	75
20-30	25	8	200
30-40	35	3	105
40-50	45	1	45
		20	440

$\operatorname{Mean} \overline{x}=\frac{\sum f_{i} x_{i}}{N}$

$\therefore \overline{x}=\frac{440}{20}$

$\therefore \overline{x}=22$

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