Class 9 Exam > Class 9 Notes > Mathematics (Maths) Class 9 > Facts that Matter: Statistics
Facts that Matter: Statistics | Mathematics (Maths) Class 9 PDF Download
- Three measures of central tendency of ungrouped data are: (i) mean, (ii) median and (iii) mode.
- The mean of ungrouped data is found by adding all the values of observation and dividing it by the total number of observations. It is denoted by
. - The median is the value of the middlemost observation.
- The mode is the most frequently occurring observation.
- If the number of observations ‘n’ is odd, then
Median = Value of theobservation. - If the number of observations ‘n’ is even, then
Median = Mean value of the and observations.
.
observation.
observations.Statistics
It is a branch of science which deals with the collection, presentation, analysis and interpretation of numerical data.
Data
Facts or numerical figures, collected with a definite purpose, are called data.
Ungrouped or Raw Data
The data obtained in original form are called raw data or ungrouped data.
Grouped Data
The data condensed into groups or classes are called grouped data.
Note:
I. The arrangement of raw numerical data in ascending or descending order of magnitude, is called an array.
II. The number of times an observation occurs in the given data is called the frequency of that observation.
The document Facts that Matter: Statistics | Mathematics (Maths) Class 9 is a part of the Class 9 Course Mathematics (Maths) Class 9.
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FAQs on Facts that Matter: Statistics - Mathematics (Maths) Class 9
| 1. What is the importance of statistics in Class 9? |  |
Ans. Statistics is important in Class 9 as it helps students understand and analyze numerical data, make informed decisions, and draw meaningful conclusions. It provides a foundation for various subjects and real-life applications such as economics, science, and social sciences.
| 2. What are the main topics covered in Class 9 statistics? | |
Ans. In Class 9 statistics, the main topics covered include data handling, representation of data in various forms such as tables and graphs, measures of central tendency (mean, median, mode), measures of dispersion (range, quartiles), probability, and basic concepts of inferential statistics.
| 3. How can statistics be applied in everyday life? | |
Ans. Statistics can be applied in everyday life in various ways. For example, it helps in analyzing survey results, making predictions based on data trends, understanding market research, interpreting medical research findings, and evaluating the impact of policies or interventions.
| 4. What are the benefits of studying statistics in Class 9? | |
Ans. Studying statistics in Class 9 offers several benefits. It improves critical thinking skills, enhances data interpretation abilities, promotes logical reasoning, and develops problem-solving skills. It also provides a foundation for higher-level statistics courses and prepares students for future academic and professional endeavors.
| 5. How can statistics help in decision-making? | |
Ans. Statistics plays a crucial role in decision-making by providing a systematic framework for analyzing data and making informed choices. It helps in evaluating options, assessing risks, and understanding the probability of outcomes. By using statistical techniques, decision-makers can minimize uncertainty and maximize the chances of successful outcomes.
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