Make histogram and frequency polygon from the following distribution.

Class-interval 0−20 20−30 30−40 40−60 60−100

Frequency 10 4 6 14 16

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Solution

Class Interval Frequency Adjusted Frequency for Histogram

0 − 20
20 − 30
30 − 40
40 − 60
60 − 100 10
4
6
14
16 10 ÷ 2 = 5
4
6
14 ÷ 2 = 7
16 ÷ 4 = 4

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$\begin{matrix} Class & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 Frequencies & 5 & 8 & 15 & 16 & 6 \end{matrix}$

Class interval	1−10	11−20	21−30	31−40	41−50	51−60
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Class	0−10	10−20	20−30	30−40	40−50	50−60	60−70
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Class-interval	0−20	20−30	30−40	40−60	60−100
Frequency	10	4	6	14	16

Class Interval	Frequency	Adjusted Frequency for Histogram
0 − 20 20 − 30 30 − 40 40 − 60 60 − 100	10 4 6 14 16	10 ÷ 2 = 5 4 6 14 ÷ 2 = 7 16 ÷ 4 = 4