Find the mean of the following frequency distribution:

Class interval: 0-10 10-20 20-30 30-40 40-50
Frequency: $9$ $12$ $15$ $10$ $14$

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Solution

Answer:-
Class interval Frequency $x_{i}$ $f_{i} x_{i}$
0-10 9 5 45
10-20 12 15 180
20-30 15 25 375
30-40 10 35 350
40-50 14 45 630
$Σ f_{i} = 60$ $Σ f_{i} x_{i} = 1580$
$m e a n = \frac{Σ f_{i} x_{i}}{Σ f_{i}} = \frac{1580}{60} = 26.33$

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27

p

Class:	0-10	10-20	20-30	30-40	40-50
Frequency:	$8$	$p$	$12$	$13$	$10$

Class Interval	0-10	10-20	20-30	30-40	40-50	50-60
Frequency	6	9	14	2	19	10

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Class interval:	0-10	10-20	20-30	30-40	40-50
Frequency:	$9$	$12$	$15$	$10$	$14$