Find the missing value in the following table:

Weight of grain (kg) 4 6 10 20

Cost ($) 20 30 50 ?

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100

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120

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150

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Solution

The correct option is C 120
Obtaining the relation between the weight and cost of grain, we have:
$\frac{Cost}{Weight} = 5$

$∴$ Cost of 20 kg of grain = 20 x 5
= $100

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Similar questions

Weight of grain (Kg)	4	6	10	20
Cost (Rs)	200	400	800

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	$10$	$f_{1}$	$25$	$30$	$f_{2}$	$10$	$100$

Marks obtained	0−10	10−20	20−30	30−40	40−50	50−60	Total
No. of Students	10	?	25	30	?	10	100

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

How to find missing frequency in median
For example:
If the median of the distribution given below is 46, find the value of the missing frequencies.

class interval	10-20	20-30	30-40	40-50	50-60	60-70	70-80
Frequency	12	30	$f_{1}$	65	$f_{2}$	25	18

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