Draw a frequency polygon for the following grouped frequency distribution table.

Age of the donor
(Yrs.)
20 - 24 25 - 29 30 - 34 35 - 39 40 - 44 45 - 49

No. of blood doners 38 46 35 24 15 12

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Solution

Consider the following table

Class
(Age of doctors in years) Continuous Class Class Mark Frequency
(Number of students)

20 - 24 19.5 - 24.5 22 38

25 - 29 24.5 - 29.5 27 46

30 - 34 29.5 - 34.5 32 35

35 - 39 34.5 - 39.5 37 24

40 - 44 39.5 - 44.5 42 15

45 - 49 44.5 - 49.5 47 12

The frequency polygon using the class mark and frequancy given in the above table as

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Q. Calculate the Mean and Standard Deviation from the following distribution.

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No. of Persons	4	20	38	24	10	4

Q. Draw a histogram and the frequency polygon from the following data.

Class interval	20−25	25−30	30−35	35−40	40−45	45−50
Frequency	30	24	52	28	46	10

Calculate the mean for the following frequency distribution:

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Frequency	6	5	9	12	6	2

Draw the frequency polygon representing the following frequency distribution.

$\begin{matrix} Class interval & 30 - 34 & 35 - 39 & 40 - 44 & 45 - 49 & 50 - 54 & 55 - 59 Frequency & 12 & 16 & 20 & 8 & 10 & 4 \end{matrix}$
[4 MARKS]

Q. The following table gives the frequency distribution of married women by age at marriage:

Age (in years)	Frequency	Age (in years)	Frequency
15−19 20−24 25−29 30−34 35−39	53 140 98 32 12	40−44 45−49 50−54 55−59 60 and above	9 5 3 3 2

Calculate the median and interpret the results.

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Age of the donor (Yrs.)	20 - 24	25 - 29	30 - 34	35 - 39	40 - 44	45 - 49
No. of blood doners	38	46	35	24	15	12

Class (Age of doctors in years)	Continuous Class	Class Mark	Frequency (Number of students)
20 - 24	19.5 - 24.5	22	38
25 - 29	24.5 - 29.5	27	46
30 - 34	29.5 - 34.5	32	35
35 - 39	34.5 - 39.5	37	24
40 - 44	39.5 - 44.5	42	15
45 - 49	44.5 - 49.5	47	12

Draw a frequency polygon for the following grouped frequency distribution table. Age of the donor (Yrs.) 20 - 24 25 - 29 30 - 34 35 - 39 40 - 44 45 - 49 No. of blood doners 38 46 35 24 15 12

Draw a frequency polygon for the following grouped frequency distribution table.

Age of the donor
(Yrs.)
20 - 24 25 - 29 30 - 34 35 - 39 40 - 44 45 - 49

No. of blood doners 38 46 35 24 15 12