Washing powders contain detergents in the range of (by mass):

10 - 15 %

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15 - 30 %

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50 - 60 %

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40 - 50 %

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Solution

The correct option is A $15 - 30 %$
Modern synthetic detergents are alkyl or aryl sulphonates produced from petroleum (or coal) and sulphuric acid. They can be defined as the sodium or potassium salt of a long chain alkyl benzene sulphonic acid or the sodium or potassium salt of a long chain alkyl hydrogen sulphate, that has cleansing properties in water.
They are used in washing powders in a proportion of about $15 - 30 %$ .

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Q. Draw a histogram for the following data:

Marks	No. of Students
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$20 - 30$	$30$
$30 - 40$	$50$
$40 - 50$	$40$
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$f$	$20$	$15$	$10$	$25$	$5$	$30$	$50$

Q. Find the median class

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Marks	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$
Number of students	$12$	$35$	$15$	$25$	$13$

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Class	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$
frequency	$6$	$5$	$8$	$15$	$7$	$6$	$3$

Find the inter quartile range for the following Data

$\begin{matrix} Class & Frequency & Cumulative Frequency 10 - 20 & 4 & 4 20 - 30 & 3 & 7 30 - 40 & 2 & 9 40 - 50 & 1 & 10 50 - 60 & 5 & 15 \end{matrix}$

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