Question

IUVIL.
30
28
10
x 20
In a city, the weekly observations made in a study on the cost of living index are
given below:
ar 6600 992
Cost of living index No. of weeks
140 - 150
5
150 - 160
10
160 - 170
2
170 - 180
9
180 - 190
6
190 - 200
2
Draw a frequency polygon for the data given (without constructing histogram)
​

Answer 1

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Answer 2

Answer:

$class \: mark \: = \frac{150 + 140}{2} = \frac{290}{2} = 145$

$class \: mark \: = \frac{160 + 150}{2} = \frac{310}{2} = 155$

$class \: mark \: = \frac{170 + 160}{2} = \frac{330}{2} = 165$

$class \: mark \: = \frac{180 + 170}{2} = \frac{350}{2} = 175$

$class \: mark \: = \frac{190 + 180}{2} = \frac{370}{2} = 185$

$class \: mark \: = \frac{200 + 190}{2} = \frac{390}{2} = 195$

This question was an example 9 of NCERT Ch-14 Class-9 Maths.

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