Find the class size of the third class.

100

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80

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90

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70

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Solution

The correct option is A $100$
The third class = $1000 - 1099$
The class size of the third class $=$ upper limit $-$ lower limit $+ 1$
We add one because the lower limit is also included in the class interval.
Hence, class size $=$ $1099 - 1000 + 1 = 100$

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Similar questions

Class-intervals	$50 - 60$	$60 - 70$	$70 - 80$	$80 - 90$	$90 - 100$	$100 - 110$
Frequency	$30$	$25$	$45$	$15$	$20$	$40$

:

Fruits	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$	$80 - 90$	$90 - 100$
Boxes	$1$	$3$	$6$	$7$	$8$	$5$	$7$

?

Fruits	$100 - 90$	$90 - 80$	$80 - 70$	$70 - 60$	$60 - - 50$	$50 - 40$	$40 - 30$
Boxes	$12$	$34$	$56$	$78$	$98$	$65$	$70$

The following is the distribution of weghts (in kg) of 52 persons:

$\begin{matrix} Weight in kg & Persons 40 - 50 & 10 50 - 60 & 15 60 - 70 & 17 70 - 80 & 6 80 - 90 & 4 \end{matrix}$

(i) What is the lower limit of class 50-60?

(ii) Find the class marks of the classes 40-50,50-60.

(iii) What is the class size?

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