# NCERT Solutions for Class 9 Maths Chapter 14

NCERT Solutions for Class 9 Maths Chapter 14 Statistics Exercise 14.1 or Exercise 14.2 or Exercise 14.3 or Exercise 14.4 in English Medium or प्रश्नावली 14.1 or प्रश्नावली 14.2 or प्रश्नावली 14.3 or प्रश्नावली 14.4  in Hindi Medium to study online or download Apps and Solutions in PDF form.

 Class 9: Maths – गणित Chapter 14: Statistics

## NCERT Solutions for Class 9 Maths Chapter 14

Go Back to Class 9 Maths Main Page

#### Hindi & English Medium Solutions

Download Hindi Medium and English Medium NCERT Solutions of all subjects prepared according to Latest CBSE Syllabus 2019-20.

##### 9 Maths Exercise 14.1 Solutions

NCERT Solutions for Class 9 Maths Chapter 14 Statistics Exercise 14.1 is given below. Solutions of other questions visit to Exercise 14.2 or Exercise 14.3 or Exercise 14.4 or go for हिंदी मीडियम Solutions. Visit to Class 9 Maths main page or Top of the page.

##### 9 Maths Exercise 14.2 Solutions

Solutions for Class 9 Maths Chapter 14 Statistics Exercise 14.2 is given below. Solutions of other questions visit to Exercise 14.1 or Exercise 14.3 or Exercise 14.4 or go for हिंदी मीडियम Solutions. Visit to Class 9 Maths main page or Top of the page.

##### 9 Maths Exercise 14.3 Solutions

NCERT Solutions 9 Maths Exercise 14.3 is given below. For solutions of other questions visit to Exercise 14.1 or Exercise 14.2 or Exercise 14.4 or go for हिंदी मीडियम Solutions. Visit to Class 9 Maths main page or Top of the page.

##### 9 Maths Exercise 14.4 Solutions

Class 9 Maths Chapter 14 Exercise 14.4 is given below. For solutions of other questions visit to Exercise 14.1 or Exercise 14.2 or Exercise 14.3 or go for हिंदी मीडियम Solutions. Visit to Class 9 Maths main page or Top of the page.

##### 9 गणित प्रश्नावली 14.1 के हल

NCERT Solutions for Class 9 Maths Chapter 14 Statistics Exercise 14.1 in Hindi is given below. For solutions of other questions visit to प्रश्नावली 14.2 or प्रश्नावली 14.3 or प्रश्नावली 14.4 or go for English Medium Solutions. Visit to Class 9 Maths main page or Top of the page.

##### 9 गणित प्रश्नावली 14.2 के हल

9 Maths Chapter 14 Exercise 14.2 in Hindi is given below. For solutions of other questions visit to  प्रश्नावली 14.1 or प्रश्नावली 14.3 or प्रश्नावली 14.4 or go for English Medium Solutions. Visit to Class 9 Maths main page or Top of the page.

##### 9 गणित प्रश्नावली 14.3 के हल

Solutions for 9 Maths Statistics Exercise 14.3 in Hindi is given below. For solutions of other questions visit to  प्रश्नावली 14.1 or प्रश्नावली 14.2 or प्रश्नावली 14.4 or go for English Medium Solutions. Visit to Class 9 Maths main page or Top of the page.

##### 9 गणित प्रश्नावली 14.4 के हल

Class 9 Maths Chapter 14 Exercise 14.4 in Hindi is given below. For solutions of other questions visit to  प्रश्नावली 14.1 or प्रश्नावली 14.2 or प्रश्नावली 14.3 or go for English Medium Solutions. Visit to Class 9 Maths main page or Top of the page.

Visit to Class 9 Maths main page or Top of the page

###### Important Terms & Definitions – Statistics
• Data: The facts or figures (observation / information collected) which are numerical or otherwise, collected with a definite purpose, are called data.
• Primary data: The data collected by the investigator himself for a definite plan or purpose, is known as primary data.
• Secondary data: The data which are not collected directly but obtained from some other sources (published or unpublished), is known as secondary data.
• Frequency Distribution: The number of entries of the data having their values lying in a class is defined as the frequency of the class. The table in which the corresponding frequency are written against each class, is called the frequency distribution of the given data.
• Class Interval: Class intervals are the groups in which all the observations are divided. Each class is bounded by two figures or numbers which are called class limits. The difference between the upper limit and the lower of a class is called class size.
• Frequency Polygon: A frequency polygon is the polygon obtained by joining the mid-points of upper horizontal sides of all the rectangle in the histogram. It can also be drawn independently without drawing histogram. For this we find class mark of each class interval.
• Mean: The mean of a number of observations is the sum of the values of all the observations divided by the total number of observations.
• Median: Median is that value of the given observation, which divides it into exactly two parts.
Mode: Mode is that value of the given data, which occurs most frequently.

#### Give five examples of data that you can collect from your day-to-day life.

Five examples of data that we can collect from our day-to-day life:
1. Height of our classmates or weight of our classmate.
2. Height of first 100 plants near by our locality.
3. Maximum or minimum temperature of a particular month.
4. Time spend for watching TV in a particular week.
5. Rainfall in our city in last 10 years.

#### आकंड़ो 14, 25, 14, 28, 18, 17, 18, 14, 23, 22, 14, 18 का बहुलक ज्ञात कीजिए।

प्रेक्षणों को आरोही क्रम में व्यवस्थित करने पर:

14, 14, 14, 14, 17, 18, 18, 18, 22, 23, 25, 28

बहुलक सबसे अधिक बार आने वाला प्रेक्षण का मान होता है।
क्योंकि प्रेक्षण 14 सबसे अधिक (4 बार) आया है।
अतः, दिए गए प्रेक्षणों का बहुलक 14 है।

#### निम्न स्थिति पर आधारित एक उदाहरण दीजिए: माध्य ही केन्द्रीय प्रवृत्ति का उपयुक्त माप है।

आंकड़ों के चरम मानों से माध्य प्रभावित होता है। यदि आंकड़ों के कुछ अंकों में अंतर बहुत अधिक हो, तो इस स्थिति में माध्य इन आंकड़ों का उत्तम प्रतिनिधित्व नहीं करता। क्योंकि आंकड़ों में उपस्थित चरम मानों से माध्यक और बहुलक प्रभावित नहीं होते हैं, इसलिए इस स्थिति में इनसे दिए हुए आंकड़ों का एक उत्तम प्रतिनिधित्व होता है।
माना निम्नलिखित आंकड़े किसी परिवार के सदस्यों की ऊँचाइएयां है।
154.9 cm, 162.8 cm, 170.6 cm, 158.8 cm, 163.3 cm, 166.8 cm, 160.2 cm
यहाँ आंकड़ों के अंकों में अंतर बहुत कम है, तो इस स्थिति में माध्य इन आंकड़ों का उत्तम प्रतिनिधित्व करता है।

#### What do understand by primary or secondary data?

When the information was collected by the investigator herself or himself with a definite objective in her or his mind, the data obtained is called primary data.

When the information was gathered from a source which already had the information stored, the data obtained is called secondary data.

#### What is statistics?

Statistics is the area of study dealing with the presentation, analysis and interpretation of data.

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