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Need for Dividing Data into Classes

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Question

The following histogram shows the frequency distribution of teaching experiences of 30 teachers in various schools :

The number of teachers with 5 to 10 years experience is

A

15

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B

10

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C

16

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D

17

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Solution

The correct option is C
16

The number of teachers with 5 to 10 years experience is 16.

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Q. The following histogram shows the frequency distribution f the ages of 22 teachers in a school:

(i) What is the number of eldest and youngest teachers in the school?
(ii) Which age group teachers are more in the school and which least?
(iii) What is the size of the classes?
(iv) What are the class marks of the classes?

60

teachers in primary schools of a Mandal are given in the following frequency distribution table. Construct the Frequency polygon and frequency curve for the data without using the histogram. (Use separate graph sheets)

Ages	$24 - 28$	$28 - 32$	$32 - 36$	$36 - 40$	$40 - 44$	$44 - 48$
No of teachers	$12$	$10$	$15$	$9$	$8$	$6$

Q. Study the following pie-chart and answer the following questions.
Percentage distribution of employees in six different professions

In the teaching profession, if three - fifths of the teachers are not permanent, what is the number of permanent teachers in the teaching profession?

Q. Question 4
Draw a histogram to represent the following grouped frequency distribution

\begin{matrix} A g e (i n y e a r s) & N u m b e r o f t e a c h e r s 20 - 24 & 10 25 - 29 & 28 30 - 34 & 32 35 - 39 & 48 40 - 44 & 50 45 - 49 & 35 50 - 54 & 12 \end{matrix}

Q. Draw a histogram to represent the following grouped frequency distribution

\begin{matrix} Age(in years) & Number of teachers 20 - 24 & 10 25 - 29 & 28 30 - 34 & 32 35 - 39 & 48 40 - 44 & 50 45 - 49 & 35 50 - 54 & 12 \end{matrix}

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Need for Dividing Data into Classes

Standard VIII Mathematics

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