Chapters
Chapter 2: Compound Interest (Without using formula)
Chapter 3: Compound Interest (Using Formula)
Chapter 4: Expansions (Including Substitution)
Chapter 5: Factorisation
Chapter 6: Simultaneous (Linear) Equations (Including Problems)
Chapter 7: Indices (Exponents)
Chapter 8: Logarithms
Chapter 9: Triangles [Congruency in Triangles]
Chapter 10: Isosceles Triangles
Chapter 11: Inequalities
Chapter 12: Mid-point and Its Converse [ Including Intercept Theorem]
Chapter 13: Pythagoras Theorem [Proof and Simple Applications with Converse]
Chapter 14: Rectilinear Figures [Quadrilaterals: Parallelogram, Rectangle, Rhombus, Square and Trapezium]
Chapter 15: Construction of Polygons (Using ruler and compass only)
Chapter 16: Area Theorems [Proof and Use]
Chapter 17: Circle
Chapter 18: Statistics
Chapter 19: Mean and Median (For Ungrouped Data Only)
Chapter 20: Area and Perimeter of Plane Figures
Chapter 21: Solids [Surface Area and Volume of 3-D Solids]
Chapter 22: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals]
Chapter 23: Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios]
Chapter 24: Solution of Right Triangles [Simple 2-D Problems Involving One Right-angled Triangle]
Chapter 25: Complementary Angles
Chapter 26: Co-ordinate Geometry
Chapter 27: Graphical Solution (Solution of Simultaneous Linear Equations, Graphically)
Chapter 28: Distance Formula
Chapter 18: Statistics
Selina solutions for Concise Mathematics Class 9 ICSE Chapter 18 Statistics Exercise 18 (A) [Pages 227 - 228]
State, the following variable is continuous or discrete:
number of children in your class.
Continuous variable.
Discrete variable.
State, the following variable is continuous or discrete:
Distance travelled by car.
Continuous variable.
Discrete variable.
State, the following variable is continuous or discrete:
Sizes of shoes.
Continuous variable.
Discrete variable.
State, the following variable is continuous or discrete: Time.
Continuous variable.
Discrete variable.
State, the following variable is continuous or discrete: Number of patients in a hospital.
Continuous variable.
Discrete variable.
Given below are the marks obtained by 30 students in an examination:
08 | 17 | 33 | 41 | 47 | 23 | 20 | 34 |
09 | 18 | 42 | 14 | 30 | 19 | 29 | 11 |
36 | 48 | 40 | 24 | 22 | 02 | 16 | 21 |
15 | 32 | 47 | 44 | 33 | 01 |
Taking class intervals 1 - 10, 11 - 20, ....., 41 - 50;
make a frequency table for the above distribution.
The marks of 24 candidates in the subject mathematics are given below:
45 | 48 | 15 | 23 | 30 | 35 | 40 | 11 |
29 | 0 | 3 | 12 | 48 | 50 | 18 | 30 |
15 | 30 | 11 | 42 | 23 | 2 | 3 | 44 |
The maximum marks are 50. Make a frequency distribution taking class intervals 0 - 10, 10-20, .......
Fill in the blank :
A quantity which can very from one individual to another is called a .............
Fill in the blank :
Sizes of shoes are ........... variables.
Fill in the blank :
Daily temperatures is ........... variable.
Fill in the blank :
The range of data 7, 13, 6, 25, 18, 20, 16 is ............
Fill in the blank :
In the class interval 35 - 46; the lower limit is .......... and the upper limit is .........
Fill in the blank :
The class mark of class interval 22 - 29 is ...........
Find the actual lower class limits, upper-class limits and the mid-values of the classes:
10 - 19, 20 - 29, 30 - 39 and 40 - 49.
Find the actual lower and upper-class limits and also the class marks of the classes:
1.1 - 2.0, 2.1 -3.0 and 3.1 - 4.0.
Use the table given below to find:
(a) The actual class limits of the fourth class.
(b) The class boundaries of the sixth class.
(c) The class mark of the third class.
(d) The upper and lower limits of the fifth class.
(e) The size of the third class.
Class Interval | Frequency |
30 - 34 | 7 |
35 - 39 | 10 |
40 - 44 | 12 |
45 - 49 | 13 |
50 - 54 | 8 |
55 - 59 | 4 |
Construct a cumulative frequency distribution table from the frequency table given below:
Class Interval | Frequency |
0 -8 | 9 |
8 - 16 | 13 |
16 - 24 | 12 |
24 - 32 | 7 |
32 - 40 | 15 |
Construct a cumulative frequency distribution table from the frequency table given below:
Class Interval | Frequency |
1 - 10 | 12 |
11 - 20 | 18 |
21 - 30 | 23 |
31 - 40 | 15 |
41 - 50 | 10 |
Construct a frequency distribution table from the following cumulative frequency distribution:
Class Interval | Cumulative Frequency |
10 - 19 | 8 |
20 - 29 | 19 |
30- 39 | 23 |
40- 49 | 30 |
Construct a frequency distribution table from the following cumulative frequency distribution:
C.I | C.F |
5 - 10 | 18 |
10 - 15 | 30 |
15 - 20 | 46 |
20 - 25 | 73 |
25 - 30 | 90 |
Construct a frequency table from the following data:
Marks | No. of students |
less than 10 | 6 |
less than 20 | 15 |
less than 30 | 30 |
less than 40 | 39 |
less than 50 | 53 |
less than 60 | 70 |
Construct the frequency distribution table from the following cumulative frequency table:
Ages | No. of students |
Below 4 | 0 |
Below 7 | 85 |
Below 10 | 140 |
Below 13 | 243 |
Below 16 | 300 |
(i) State the number of students in the age group 10 - 13.
(ii) State the age-group which has the least number of students.
Fill in the blank in the following table:
Class interval | Frequency | Cumulative Frequency |
25 - 34 | ...... | 15 |
35 - 44 | ...... | 28 |
45 - 54 | 21 | ...... |
55 - 64 | 16 | ...... |
65 - 74 | ...... | 73 |
75 - 84 | 12 | ...... |
The value of π up to 50 decimal place is
3.14159265358979323846264338327950288419716939937510
(i) Make a frequency distribution table of digits from 0 to 9 after the decimal place.
(ii) Which are the most and least occurring digits?
Selina solutions for Concise Mathematics Class 9 ICSE Chapter 18 Statistics Exercise 18 (B) [Page 233]
Construct a frequency polygon for the following distribution:
Class-intervals | 0-4 | 4 - 8 | 8 - 12 | 12 - 16 | 16 - 20 | 20 - 24 |
Frequency | 4 | 7 | 10 | 15 | 11 | 6 |
Construct a combined histogram and frequency polygon for the following frequency distribution:
Class-Intervals | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 |
Frequency | 3 | 5 | 6 | 4 | 2 |
Construct a frequency polygon for the following data:
Class-Intervals |
10 - 14 |
15 - 19 |
20 - 24 |
25 - 29 |
30 - 34 |
Frequency |
5 |
8 |
12 |
9 |
4 |
The daily wages in a factory are distributed as follows:
Daily wages (in Rs.) |
125 - 175 |
175 - 225 |
225 - 275 |
275 - 325 |
325 - 375 |
Number of workers |
4 |
20 |
22 |
10 |
6 |
Draw a frequency polygon for this distribution.
Draw frequency polygons for each of the following frequency distribution:
(a) using histogram
(b) without using histogram
C.I |
10 - 30 |
30 - 50 |
50 - 70 | 70 - 90 | 90 - 110 | 110 - 130 | 130 - 150 |
ƒ | 4 | 7 | 5 | 9 | 5 | 6 | 4 |
Draw frequency polygons for each of the following frequency distribution:
(a) using histogram
(b) without using histogram
C.I |
5 -15 | 15 -25 | 25 -35 | 35 - 45 | 45-55 | 55-65 |
ƒ | 8 | 16 | 18 | 14 | 8 | 2 |
Chapter 18: Statistics
Selina solutions for Concise Mathematics Class 9 ICSE chapter 18 - Statistics
Selina solutions for Concise Mathematics Class 9 ICSE chapter 18 (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 Concise Mathematics Class 9 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. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
Concepts covered in Concise Mathematics Class 9 ICSE chapter 18 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.
Using Selina 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 Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 9 prefer Selina Textbook Solutions to score more in exam.
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