In which hour interval, the children are $55$ ?

0 - 10

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10 - 20

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20 - 30

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30 - 40

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Solution

The correct option is A $10 - 20$
From the histogram,
The number of children entered during $0 - 10$ hours $= 45$
The number of children entered during $10 - 20$ hours $= 55$
The number of children entered during $20 - 30$ hours $= 15$
The number of children entered during $30 - 40$ hours $= 25$
The number of children entered during $40 - 50$ hours $= 85$
The number of children entered during $50 - 60$ hours $= 10$ .

Therefore, $55$ children entered into the library between the interval $10 - 20$ .

Hence, option $B$ is correct.

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Similar questions

a) Which class has the highest frequency?

b) If Sachin scores 20 then in which interval will he be placed in?

c) What is the upper-class limit of the class interval 10-20?

$\begin{matrix} R u n s & C r i c k e t e r s 0 - 10 & 10 10 - 20 & 3 20 - 30 & 14 30 - 40 & 25 40 - 50 & 11 \end{matrix}$

Calculate mean and standard deviation :

$\begin{matrix} Class Interval & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 Frequency & 8 & 13 & 16 & 8 & 5 \end{matrix}$

Q. Consider following frequency distribution.

Class Intervals	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$
Frequency	$8$	$10$	$12$	$15$

Arithmetic mean

=

Q. Calculate the mean deviation for the data given here:

Class interval	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$
Frequency	$5$	$3$	$9$	$12$	$6$

Q. Calculate the mean of the following distribution:

Class Interval	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$
Frequency	$8$	$5$	$12$	$35$	$24$	$16$

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In which hour interval, the children are 55?

In which hour interval, the children are $55$ ?