Points to Remember: Statistics | Mathematics (Maths) Class 10 PDF Download

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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.
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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.
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