**Pre-Requisites**

- Basic understanding

## Learning Objective

On successful completion of this lesson, students will be able to:

- demonstrate basic knowledge of average.
- analyze the concept to find average.
- develop problem-solving skills.
- apply in real life.

**Dictionary**

**Average**: Mean**Numeral**: Number**>**: Greater than**<**: Lesser than**=**: Equal to**Ascending**: Increasing**Descending**: Decreasing**Order**: Sequence

**12.1 Introduction**

#### Formula

To find average:

**Average = Sum of all observations / Number of the observations**

**12.2 Characteristics of average**

- It is a ratio.
- It gives an approx value.
- It is found to get an idea.
- It makes data to be remembered easily.
- It is used to analyse the data.

#### Solved Examples

**Ex1. In a test, the marks obtained by Kajal are:**

Maths | English | Hindi | Science | S.Sci |

90 | 85 | 80 | 75 | 70 |

**Find her average marks per subject.**

**Sol.** We have:

Since, Sum of all the marks obtained= 90+85+80+75+70= 400

And, Number of the subjects= 5

Therefore , Average marks per subject = Sum of all marks obtained/ Number of the subjects

= 400/ 5

= 80

Thus, Kajal’s average marks per subject is 80.

**Ex2. The daily earnings of a rickshaw puller during a week are:**

**Rs150, Rs140, Rs145, Rs130, Rs120, Rs90, Rs50. Find his average daily earning.**

**Sol. **Total earnings = Rs(150+140+145+130+120+90+50)

Number of days = 7

Average earning per day = Rs825/7 =Rs117.85

Thus, his average daily earning is Rs117.85

**Ex3. Find the average of the numbers 1, 2, 3, 4, 5.**

**Sol**. Average = 1+2+3+4+5/5 = 15/5 = 3

Thus, tthe average of the given numbers is 3.

**12.3 Practice Sets **

- Fill Type
- Match Type
- Order Type
- Conversion Type
- Compare Type
- Error Type
- Statement Type
- True/False Type
- Related Type
- Day-to-Day Type
- Miscellaneous Type

#### Set-1

**1.**Find the average.

**2. **Find the average of all odd numbers between

**3. Which of the following are meaningless?**

**4. Compare and put symbol >, < or =in the placeholder.**

**5. Fill in the blanks.**

**6. Cross (x) the Roman numerals which are not written correctly.**

**7. Write the following Roman numerals in ascending order.**

**8. Write the following Roman numerals in descending order.**

**9. Solve & write the answer in Roman numerals.**

**10. Complete the following table.**

#### Set-2

#### Set-3

#### Set-4

#### Set-5

**12.4 Quiz**

**12.5 Test**

**12.6 Exam**

The exam will be conducted after the completion of the course.

**12.7 Ask Question**

Ask your doubts **here**

#### …..The End…..

**Other Notes**

- Counting from one to hundred: एक से लेकर सौ तक गिनती
- Punctuation Mark: विराम चिन्ह
- Roman Numerals : 1 to 3000
- Testing
- Words Start with letter G
- Words Start with letter F
- Words Start with letter E
- Words Start with letter D
- Words Start with letter C
- Words Start with letter B