Selina solutions for Concise Mathematics Class 9 ICSE chapter 18 - Statistics [Latest edition]

State, the following variable is continuous or discrete:
number of children in your class.

State, the following variable is continuous or discrete:
Distance travelled by car.

State, the following variable is continuous or discrete:
Sizes of shoes.

State, the following variable is continuous or discrete: Time.

State, the following variable is continuous or discrete: Number of patients in a hospital.

Given below are the marks obtained by 30 students in an examination:

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:

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.

Construct a cumulative frequency distribution table from the frequency table given below:

Construct a cumulative frequency distribution table from the frequency table given below:

Construct a frequency distribution table from the following cumulative frequency distribution:

Construct a frequency distribution table from the following cumulative frequency distribution:

Construct a frequency table from the following data:

Construct the frequency distribution table from the following cumulative frequency table:

(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:

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?

Construct a frequency polygon for the following distribution:

Construct a combined histogram and frequency polygon for the following frequency distribution:

Construct a frequency polygon for the following data:

The daily wages in a factory are distributed as follows:

Draw a frequency polygon for this distribution.

Draw frequency polygons for each of the following frequency distribution: 

(a) using histogram

(b) without using histogram

Draw frequency polygons for each of the following frequency distribution:
(a) using histogram
(b) without using histogram