Find the missing number.
$8, 12, 10, 16, 12, . . . .$ .

10

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20

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30

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40

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Solution

The correct option is A $20$
In this, there are two series following:
One is $8, 10, 12, 14$
Other is $12, 16, 20$
So, the series would be $8, 12, 10, 16, 12, 20, 14$
Hence, the missing number is $20$ .

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Similar questions

Marks	0−10	10−20	20−30	30−40	40−50
No. of Students	8	?	40	?	10

25.2

x

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

Find the missing frequency in the following distribution if $N = 100$ and median is $32$

Marks	0-10	10-20	20-30	30-40	40-50	50-60	Total
No. of students	10	?	25	30	?	10	100

f_{1}

f_{2}

N = 100

32

Class	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$T o t a l$
Frequency	$10$	$f_{1}$	$25$	$30$	$f_{2}$	$10$	$100$

32.5

Class interval:	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	Total
Frequency:	$f_{1}$	$5$	$9$	$12$	$f_{2}$	$3$	$2$	$40$

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