NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 8

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Exercise 14.3

Q.1. The blood groups of 30 students are recorded as follows: A, B, O, A, AB, O, A, O, B, A, O, B, A, AB, B, A, AB, B, A, A, O, A, AB, B, A, O, B, A, B, A Prepare a frequency distribution table for the data.

Answer:

The Blood Groups of 30 Students Are Recorded as Follows
The blood groups of 30 students are recorded as follows

Blood Group

Number of Students (frequency)

A

12

B

8

AB

4

O

6

Total

30

Q.2. The value of π upto 35 decimal places is given below: Make a frequency distribution of the digits 0 to 9 after the decimal point.

Answer:

The Value of Π Upto 35 Decimal Places is Given Below
The value of π upto 35 decimal places is given below

Digit

0

1

2

3

4

5

6

7

8

9

Frequency

1

2

5

6

3

4

3

2

5

4

Q.3. The scores (out of 100) obtained by 33 students in a mathematics test are as follows:

Represent this data in the form of a frequency distribution.

Answer:

The Scores (Out of 100) Obtained by 33 Students in a Mathematics Test Are as Follows
The scores (out of 100) obtained by 33 students in a mathematics test are as follows

Scores

48

58

64

66

69

71

73

81

83

84

Frequency

3

3

4

7

6

3

2

1

2

2

Q.4. Prepare a continuous grouped frequency distribution from the following data:

Prepare a Continuous Grouped Frequency Distribution from the Following Data
Prepare a continuous grouped frequency distribution from the following data

Mid-point

Frequency

5

4

15

8

25

13

35

12

45

6

Answer:

Continuous Grouped Frequency Distribution Class Size = 10
Continuous grouped frequency distribution Class size = 10

Class

Frequency

Class size = 10

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