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S T A T I S T I C S S T A T I S T I C S
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S T A T I S T I C S S T A T I S T I C S
Points to Remember
The mean for grouped data can be found by:
? the direct method;
()the assumed mean method!
(i) the step deviation method
with the assumption that the frequency of a class is centred at its mid-point, called its
class mark.
Page 3


S T A T I S T I C S S T A T I S T I C S
Points to Remember
The mean for grouped data can be found by:
? the direct method;
()the assumed mean method!
(i) the step deviation method
with the assumption that the frequency of a class is centred at its mid-point, called its
class mark.
The cumulative frequency of a class is the frequency 
obtained by adding the frequencies of all the classes 
preceding the given class.
The median for grouped data is formed by using the formula:
where symbols have their usual meanings.
The mode for grouped data can be found by using the formula:
where symbols have their usual meanings.
M o d e
M e d i a n
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FAQs on Points to Remember: Statistics - Mathematics (Maths) Class 10

1. What is the importance of statistics in everyday life?
Ans. Statistics is crucial in everyday life as it helps individuals to make informed decisions based on data analysis. It is used in various fields such as healthcare, business, education, and social sciences to interpret data trends and patterns, enabling better predictions and choices.
2. What are the different types of statistics?
Ans. There are two main types of statistics: descriptive statistics, which summarize and describe the characteristics of a dataset, and inferential statistics, which use sample data to make generalizations or predictions about a larger population. Both types are essential for effective data analysis.
3. How do you interpret a statistical graph?
Ans. To interpret a statistical graph, one should look at the axes to understand the variables being represented, examine the scale to gauge the data range, and analyze the overall shape and trends of the data. Understanding the context and the type of graph (e.g., bar graph, line graph) is also important for accurate interpretation.
4. What is the role of probability in statistics?
Ans. Probability plays a vital role in statistics as it provides a framework for quantifying uncertainty and making predictions about future events. It helps in determining the likelihood of different outcomes and is foundational for various statistical analyses and inferential statistics.
5. How can someone improve their statistical skills?
Ans. To improve statistical skills, one can start by taking online courses or attending workshops, practicing with real datasets, and using statistical software. Additionally, reading books and articles on statistics, as well as engaging in discussions with peers or professionals, can enhance understanding and application.
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