**Exercise 22**

**Q1) Define the terms:**

**(i) Data (ii) Raw Data (iii) Array**

**(iv) Tabulation of data (v) Observations**

**(vi) Frequency of an observation (vii) Statistics**

**Ans. 1)**

**(i) **Data: It refers to the information in the form of numerical figures.

The marks obtained by 5 students of a class in a unit test are 34, 45, 65, 67, 87.

We call it the data related to the marks obtained by 5 students of a class in a unit test.

**(ii)** Raw Data: Data obtained in the original form is called raw data.

**(iii) **Arrray: Arranging the numerical figures in an ascending or a descending order is called an array.

**(iv) **Tabulation of data: Arranging the data in a systematic form in the form of a table is called tabulation or presentation of the data.

**(v) Observations: **Each numerical figure in a data is called an observation

**(vi) Frequency of an observation: **The number of times a particular observation occurs is called its frequency.

**(vii) **Statistics: It is the science that deals with the collection, presentation, analysis and interpretation of numerical data.

**Q2) The number of children in 25 families of a colony are given below:**

**2 , 0 , 2 , 4 , 2 , 1 , 3 , 3 , 1 , 0 , 2 , 3 , 4 , 3 , 1 , 1 , 1 , 2 , 2 , 3 , 2 , 4 , 1 , 2 , 2 .**

**Represent the above data in the form of a frequency distribution table.**

**Ans. 2) **

**Q3) The sale of shoes of various sizes at a shop on particular day is given below:**

**6 , 9 , 8 , 5 , 5 , 4 , 9 , 8 , 5 , 6 , 9 , 9 , 7 , 8 , 9 , 7 , 6 , 9 , 8 , 6 , 7 , 5 , 8 , 9 , 4 , 5 , 8 , 7 .**

**Represent the above data in the form of a frequency distribution table.**

**Ans. 3) **

**Q4) Construct a frequency table for the following:**

**3 , 2 , 5 , 4 , 1 , 3 , 2 , 2 , 5 , 3 , 1 , 2 , 1 , 1 , 2 , 2 , 3 , 4 , 5 , 3 , 1 , 2 , 3.**

**Ans. 4) **

**Q5) Construct a frequency table for the following:**

**7 , 8 , 6 , 5 , 6 , 7 , 7 , 9 , 8 , 10 , 7 , 6 , 7 , 8 , 8 , 9 , 10 , 5 , 7 , 8 , 7 , 6.**

**Ans. 5) **

**Q6) Fill in the blanks:**

**(i) Data means information in the form of _______ .**

**(ii) Data obtained in the _____ form is called raw data.**

**(iii) Arranging the numerical figures in an ascending or a descending order is called an ______ .**

**(iv) The number of times a particular observations occurs is called its ______ .**

**(v) Arranging the data in the form of a table is called ______ .**

**Ans. 6)**

(i) numerical figures

(ii) original

(iii) array

(iv) frequency

(v) tabulation of data