15. Frequency Distribution:
(a) Frequency Distribution of Discrete Data: There are no class boundaries because discrete data are not in fractions. If class interval size is one we usually take single values.
No. of children in a family

Number of families

0

7

1

3

2

25

3

16

4

9

5

4

6

1

Total

65

Heights of students in a
class (inches)

Number of students

55.558.0

1

58.060.5

6

60.563.0

17

63.065.5

18

65.568.0

18

68.070.5

4

70.573.0

1

Total (S f)

65

Heights (inches)

No. of students
Less than
Cumulative
Frequency

Heights (inches)

No. of students
Greater than
Cumulative
Frequency

Less than 55.5

0

55.5 and more

65

Less than 58.0

1

58.0 and more

64

Less than 60.5

7

60.5 and more

58

Less than 63.0

24

63.0 and more

41

Less than 65.5

42

65.5 and more

23

Less than 68.0

60

68.0 and more

5

Less than 70.5

64

70.5 and more

1

Less than 73.0

65

73.0 and more

0

Heights

Frequency
(No. of students)

Relative frequency
(%)

55.558.0  1  1 / 65 × 100 = 1.54 
58.060.5  6  6 / 65 × 100 = 9.23 
60.563.0  17  26.15 
63.065.5  18  27.69 
65.568.0  18  27.69 
68.070.5  4  6.16 
70.573.0  1  1.54 
65  100 
Heights
(Inches)

No. of
students
Less than
Cumulative
Frequency

Relative
Frequency

Heights
(Inches)

No. of
students
Greater
than
Cumulative
Frequency

Relative
Frequency

Less than 55.5 
0

0

55.5 and more 
65

100

Less than 58.0 
1

1 / 65 × 100 = 1.54

58.0 and more 
64

98.46

Less than 60.5 
7

7 / 65 × 100 = 10.77

60.5 and more 
58

89.23

Less than 63.0 
24

36.92

63.0 and more 
41

63.08

Less than 65.5 
42

64.61

65.5 and more 
23

35.38

Less than 68.0 
60

92.31

68.0 and more 
5

7.69

Less than 70.5 
64

98.46

70.5 and more 
1

1.54

Less than 73.0 
65

100

73.0 and more 
0

0

Weights
(pounds)

Heights
(inches)


5759

6062

6365

6668

6971

7274

Total


100104

3

7









10

105109



5

10

2

1



18

110114

1

1

4

6

4

0

14

115119





1

1

4

2

8

Total

3

12

15

9

9

2

50

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