1.

(ii) Following is the frequency distribution with unknown frequencies :Class 20 – 30 30 – 40 40 – 50 50 – 60 TotalFrequency a 2a 3a a 70Find the value of a and prepare a frequency distribution table for drawing afrequency polygon. Draw a frequency polygon.​

Answer»

FOLLOWING is the frequency distribution with unknown FREQUENCIES :

Class 20 – 30 30 – 40 40 – 50 50 – 60 Total

Frequency a 2A 3a a 70

Given,

From given data we have,

a + 2a + 3a + a = 70

7a = 70

a = 70/7

a = 10

a = 10, 2a = 10, 3a = 30

Frequency distribution table

Class                  Frequency

20 – 30                    10

30 – 40                    20

40 – 50                    30

50 – 60                    10

The diagram of frequency polygon is ATTACHED below.


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