C.I. 0-10 10-20 20-30 30-40 40-50
Frequency 7 5 3 4 6
Find the mean of the following continuous distribution

23.8

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22.8

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25.8

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24.8

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Solution

The correct option is A $23.8$
C.I. Frequency (f)
Class Mark (x)
fx
0-10 7 5 35
10-20 5 15 75
20-30 3 25 75
30-40 4 35 140
40-50
Mean $= \frac{\sum f x}{\sum f} = \frac{595}{25} = 23.8$
6
$\sum f = 25$
45 270
$\sum f x = 595$

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25.2

x

$C . I .$	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$
frequency	$8$	$X$	$10$	$11$	$9$

31.4

x

Class	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$
Frequency	$5$	$x$	$10$	$12$	$7$	$8$

Class interval	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
Frequency	$5$	$8$	$7$	$12$	$28$	$20$	$10$	$10$

Class	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$
Frequency	$2$	$3$	$7$	$8$	$5$

Class-interval	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$
Frequency	$7$	$14$	$28$	$26$	$16$	$9$

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