The mean of the following frequency distribution is equal to- x 4 7 10 13 16- fi 2 5 3 7 8- -

[ x_i amp; f_i amp;f_ix_i; 4 amp; 2 amp; 8; 7 amp; 5 ...

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Mean

The mean of t...

Question

The mean of the following frequency distribution is equal to
$\begin{matrix} x & 4 & 7 & 10 & 13 & 16 f_{i} & 2 & 5 & 3 & 7 & 8 \end{matrix}$

11.68

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11.88

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12.65

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10.86

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Solution

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Calculate the mean for the following frequency distribution:

Marks	10 - 20	20 - 30	30 - 40	40 - 50	50 - 60	60 - 70	70 - 80
Frequency	3	7	10	6	8	2	4

x	3	5	7	9	11	13
f	6	8	15	p	8	4

Calculate the mean deviation about the median of the following frequency distribution:

$x_{i}$	$5$	$7$	$9$	$11$	$13$	$15$	$17$
$f_{i}$	$2$	$4$	$6$	$8$	$10$	$12$	$8$

Items	0−5	5−10	10−15	15−20	20−25	25−30	30−35	35−40
Frequency	2	5	7	13	21	16	8	3

Class	1-3	3-5	5-7	7-9
Frequency	9	22	27	18

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