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Frank solutions for Class 9 Maths ICSE chapter 22 - Statistics [Latest edition]

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Chapters

Class 9 Maths ICSE - Shaalaa.com

Chapter 22: Statistics

Exercise 22.1Exercise 22.2Exercise 22.3
Exercise 22.1

Frank solutions for Class 9 Maths ICSE Chapter 22 Statistics Exercise 22.1

Exercise 22.1 | Q 1

Define primary data and secondary data.

Exercise 22.1 | Q 2.1

Explain the meaning of the following terms: Variate

Exercise 22.1 | Q 2.2

Explain the meaning of the following terms: Class mark

Exercise 22.1 | Q 2.3

Explain the meaning of the following terms: True Class Limits

Exercise 22.1 | Q 2.4

Explain the meaning of the following terms: Frequency

Exercise 22.1 | Q 3

The mark obtained by the students in a class test are given below: 
31, 12, 28, 45, 32, 16, 49, 12, 18, 26, 34, 39, 29, 28, 25, 46, 32, 13, 14, 26, 25, 34, 23, 23, 25, 45, 33, 22, 18, 37, 26, 19, 20, 30, 28, 38, 42, 21, 36, 19, 20, 40, 48, 15, 46, 26, 23, 33, 47, 40.

Arrange the above marks in classes each with a class size of 5 and answer the following:
(i) what is the highest score?
(ii) What is the lowest score?
(iii) What is the range?
(iv) If the pass mark is 20, how many students failed/
(v) How many students got 40 or more marks?

Exercise 22.1 | Q 4

The runs scored by a cricket player in the last 30 innings are:
75, 125, 36, 89, 154, 56, 12, 28, 96, 142, 78, 54, 30, 88, 116, 104, 55, 84, 10, 29, 31, 08, 24, 136, 117, 22, 99, 80, 112, 35.
Arrange these scores in an ascending order and answer the following:
(i) Find the highest score.
(ii) Find the number of centuries scored by him.
(iii) Find the number of times he scored over 50.
(iv) Find the number of times he failed to score a 50.

Exercise 22.1 | Q 5

Find the class boundaries and class marks of the following classes:
55 - 59, 60 - 64, 65 - 69, 70 - 74, 75 - 79, 80 - 84, 85 - 89, 90 - 94 and 95 - 99.

Exercise 22.1 | Q 6

Find the actual (or true) lower and upper class limits and class-marks (or mid values) of the following classes: 2.1 - 4.0, 4.1 - 6.0 and 6.1 - 8.0.

Exercise 22.1 | Q 7

Observe the given frequency table to answer the following:

Class Interval 20 - 24 25  29 30 - 34 35 - 39 40 - 44 45 - 49
Frequency 6 12 10 15 9 2

a. The true class limits of the fifth class.
b. The size of the second class.
c. The class boundaries of the fourth class.
d. The upper and lower limits of the sixth class.
e. The class mark of the third class.

Exercise 22.1 | Q 8

The number of goals scored by Arsenal Football Club in the English Premier League in the season 2007 were:
1, 2, 1, 3, 2, 5, 1, 6, 4, 4, 2, 3, 5, 6, 4, 2, 2, 3, 4, 1, 0, 5, 0, 5, 3, 2, 3, 4, 4, 1, 1, 2, 4, 3. 1. 4
Arrange these data in a distance frequency distribution table and answer the following:
(i) What is the range of the number of goals scored by AFC?
(ii) How many times did AFC score 3 or more than 3 goals?
(iii) Which variatie has the highest frequency?

Exercise 22.1 | Q 9

If the class intervals of a frequency distribution are 5 - 12, 13 - 20, 21 - 28, 29 - 36, 37 - 44, 45 - 52 and 53 - 60, find the following:
(i) The class limits and class boundaries of 21 - 28
(ii) The class size and the class mark of the class interval 45 - 52.
(iii) Find the true class limits of all the class intervals.

Exercise 22.1 | Q 10

The class marks of a frequency distribution are: 15, 25, 35, 45, 55, 65 and 75. Determine the class limits.

Exercise 22.1 | Q 11

The class marks of a frequency distribution are: 27, 32, 37, 42, 47, 52, 57, 62, 67, 72 and 77. Find the class size and true class limits.

Exercise 22.1 | Q 12

Construct a grouped frequency table from the following data of the daily wages earned by 60 labourers in a company. Take each class size as 7.
25, 26, 34, 48, 39, 16, 55, 28, 37, 42, 45, 55, 28, 54, 53, 18, 35, 47, 44, 28, 55, 45, 39, 54, 21, 49, 45, 38, 29, 53, 48, 44, 15, 28, 14, 32, 15, 44, 14, 15, 16, 41, 33, 52, 29, 34, 51, 22, 19, 37, 44, 25, 48, 38, 24, 52, 51, 42, 32, 27.

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Exercise 22.2

Frank solutions for Class 9 Maths ICSE Chapter 22 Statistics Exercise 22.2

Exercise 22.2 | Q 1

Prepare a cumulative frequency distribution table of the marks scored by 60 students in a test are given below:

Marks No. of students
0 - 10 4
10  20 15
20 - 30 21
30 - 40 12
40  50 8
Exercise 22.2 | Q 2

The table given below shows the ages of patients being treated in a hospital. Construct a cumulative frequency distribution table for the same:

Age No. of patients
10 - 20 90
20 - 30 50
30 - 40 60
40 - 50 80
50 - 60 50
60 - 70 30
Exercise 22.2 | Q 3

The electricity bills of 45 houses in a particular locality are given below. Tabulate the given data and present it as a cumulative frequency table with one of the classes being 300 - 450:
784, 567, 890, 231, 150, 458, 356, 762, 386, 824, 525, 663, 724, 841, 315, 641, 156, 715, 156, 317, 814, 547, 879, 456, 463, 664, 175, 584, 515, 487, 871, 511, 522, 454, 247, 819, 412, 326, 445, 311, 321, 545, 344, 266, 351.

Exercise 22.2 | Q 4

From the cumulative frequency distribution given below, construct a frequency distribution table:

Marks c.f.
Less than 10 10
Less than 20 18
Less than 30 32
Less than 40 45
Less than 50 50
Exercise 22.2 | Q 5

Construct a frequency distribution table from the given cumulative frequency distribution showing the weights of 750 students in a school:

Weight (in kg) c.f.
More Than 25 750
More Than 30  640
More Than 35 615
More Than 40 485
More Than 45 370
More Than 50 220
More Than 55 124
More Than 60 49
More Than 65 24
More Than 70 0

a. Find the number of students whose weight lie in the interval 40-45
b. Find the interval which has the most number of students.

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Exercise 22.3

Frank solutions for Class 9 Maths ICSE Chapter 22 Statistics Exercise 22.3

Exercise 22.3 | Q 1.1

For the set of numbers given below, find mean: 5, 7, 8, 4, 6

Exercise 22.3 | Q 1.2

For the set of numbers given below, find mean: 3, 0, 5, 2, 6, 2

Exercise 22.3 | Q 2

Calculate man of the following: 4, 6, 6, 6, 7, 7, 7, 7, 8, 8, 9, 9, 11, 3

Exercise 22.3 | Q 3

The weight of the seven members of a family, in kilograms are given below:
20, 52, 56, 72, 64, 13, 80.
Find mean weight.

Exercise 22.3 | Q 4

A boy scored the following marks in various class tests during a terminal exam, each test being marked out of 20.
17, 15, 16, 7, 10, 14, 12, 19, 16, 12
Find his average mean marks.

Exercise 22.3 | Q 5

Individual scores of a school cricket eleven in a match are given below:
10, 9, 31, 45, 0, 4, 8, 15, 12, 0, 6
Find the average score.

Exercise 22.3 | Q 6

The daily maximum relative humidity (in percent) in Mumbai from May 1 to May 7, 1992 is given below: 64, 70, 65, 80, 75, 78
Find the mean.

Exercise 22.3 | Q 7

The marks obtained by 10 students are listed below:
2, 5, 3, 8, 0, 9, x, 6, 1, 8
If the mean marks is 5, find x.

Exercise 22.3 | Q 8

The height of 8 students X in centimetres are given below:
148, 162, 160, 154, 170, 162, x, 152
If the mean height is 158, find x.

Exercise 22.3 | Q 9

If the mean of 7, 16, 9, 15, 16, a, 12, 8, b, 11 is 12, write a in terms of b.

Exercise 22.3 | Q 10.1

A test  out of 25 marks was given to 16 students and marks scored are recorded below:
25, 8, 14, 20, 16, 22, 10, 15, 8, 7, 24, 18, 19, 6, 11, 14
Find the mean marks

Exercise 22.3 | Q 10.2

A test out of 25 marks was given to 16 students and marks scored are recorded below: 25, 8, 14, 20, 16, 22, 10, 15, 8, 7, 24, 18, 19, 6, 11, 14
In the report, marks were entered out of 50. What is the mean of the recorded marks in the report?

Exercise 22.3 | Q 11.1

In History project, marks out of 20 were awarded to 8 students. The marks were as shown below:
14, 16, 18, 14, 16, 14, 12, 16
Find the mean marks.

Exercise 22.3 | Q 11.2

In History project, marks out of 20 were awarded to 8 students. The marks were as shown below: 14, 16, 18, 14, 16, 14, 12, 16
Each of the above students was 2 extra marks for submitting the project a week before the due date. What is the revised mean of this group?

Exercise 22.3 | Q 12.1

The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is  increased by 5

Exercise 22.3 | Q 12.2

The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is decreased by 8

Exercise 22.3 | Q 12.3

The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is multiplied by 4

Exercise 22.3 | Q 12.4

The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is divided by 0.25

Exercise 22.3 | Q 12.5

The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is increased by 50%

Exercise 22.3 | Q 12.6

The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is decreased by 10%

Exercise 22.3 | Q 13

The mean of 4 observations is 20. If one observation is excluded, the mean of the remaining observations becomes 15. Find the excluded observation.

Exercise 22.3 | Q 14

The mean monthly income of 8 men is Rs. 8079.75. A man whose monthly income is Rs. 8280 has also been taken into consideration. Calculate the mean monthly income of all the men.

Exercise 22.3 | Q 15

The mean of 200 observations is 20. It is found that the value of 180 is wrongly copied as 280. Find the actual mean.

Exercise 22.3 | Q 16.1

Find the median of the following sets of numbers.
15, 8, 14, 20, 13, 12, 16

Exercise 22.3 | Q 16.2

Find the median of the following sets of numbers.
25, 11, 15, 10, 17, 6, 5, 12.

Exercise 22.3 | Q 17

Calculate the median of the following sets of number:
1, 9, 10, 8, 2, 4, 4, 3, 9, 1, 5, 6, 2 and 4.

Exercise 22.3 | Q 18

3, 8, 10, x, 14, 16, 18, 20 are in the ascending order and their median is 13. Calculate the numerical value of x.

Exercise 22.3 | Q 19

The following data has been arranged in ascending order.
0, 1, 2, 3, x + 1, x + 5, 20, 21, 26, 29.
Find the value of x, if the median is 5.

Exercise 22.3 | Q 20.1

A boy scored the following marks in various class tests during a term, each test being marked out of 20.
15, 17, 16, 7, 10, 12, 14, 16, 19, 12, 16
What is his mean marks?

Exercise 22.3 | Q 20.2

A boy scored the following marks in various class tests during a term, each test being marked out of 20.
15, 17, 16, 7, 10, 12, 14, 16, 19, 12, 16
What is his median marks?

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Chapter 22: Statistics

Exercise 22.1Exercise 22.2Exercise 22.3
Class 9 Maths ICSE - Shaalaa.com

Frank solutions for Class 9 Maths ICSE chapter 22 - Statistics

Frank solutions for Class 9 Maths ICSE chapter 22 (Statistics) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Class 9 Maths ICSE solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Frank textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 9 Maths ICSE chapter 22 Statistics are Variable, Tabulation of Data, Frequency, Frequency Distribution Table, Class Intervals and Class Limits, Cumulative Frequency Table, Graphical Representation of Data, Concepts of Statistics, Frequency Distribution Table, Graphical Representation of Continuous Frequency Distribution, Mean of Ungrouped Data, Properties of Mean, Concept of Median.

Using Frank Class 9 solutions Statistics exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Frank Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 9 prefer Frank Textbook Solutions to score more in exam.

Get the free view of chapter 22 Statistics Class 9 extra questions for Class 9 Maths ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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