# NCERT Solutions for Class 9 Maths Chapter 14

NCERT Solutions for Class 9 Maths Chapter 14 Statistics Exercise 14.1, Exercise 14.2, Exercise 14.3 and Exercise 14.4 in English Medium and Hindi Medium free to download in PDF updated for new academic session 2020-21.

Download प्रश्नावली 14.1, प्रश्नावली 14.2, प्रश्नावली 14.3 and प्रश्नावली 14.4 in Hindi Medium to study online or download in PDF form for academic year 2020-21. NCERT Solutions Apps 2020-21 and NCERT Solutions all are updated for new academic session 2020-21 for UP Board, MP Board and other board also who are following latest NCERT Books 2020-2021.## NCERT Solutions for Class 9 Maths Chapter 14

Class: | 9 |

Subject: | Maths – गणित |

Chapter 14: | Statistics |

### 9th Maths Chapter 14 Solutions in English & Hindi Medium

NCERT Solutions for Class 9 Maths Chapter 14 Statistics all exercises are given below updated for new academic session 2020-21. Download NCERT Solutions Offline Apps based on latest CBSE Syllabus 2020-21 for all boards who are using NCERT Books 2020-21.

### 9th Maths Exercise 14.1 Solutions

### 9th Maths Exercise 14.2 Solutions

### 9th Maths Exercise 14.3 Solutions

### 9th Maths Exercise 14.4 Solutions

### Study Material for 2020-21

##### What do you understand by data? What are the main data types?

Data: The facts or figures (observation / information collected) which are numerical or otherwise, collected with a definite purpose, are called data.

Data can be further divided into two categories as follows:

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Secondary data: The data which are not collected directly but obtained from some other sources (published or unpublished), is known as secondary data.

##### What is meant by Frequency Distribution of 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.

##### What is meant by Class Interval? What is Class size?

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.

##### What is a Frequency Polygon?

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.

#### Important Notes on 9th Maths Chapter 14

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.

### Important Questions on 9th Maths Chapter 14

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.

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।

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।

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