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# Points to Remember

Maths : Statistics: Points to Remember

Points to Remember

The information collected for a definite purpose is called data.

The data collected by the investigator are known as primary data. When the information is gathered from an external source,the data are called secondary data.

Initial data obtained through unorganized form are called Raw data.

Mid Value = [ UCL + LCL ] /2 (where UCL–Upper Class Limit, LCL–Lower Class Limit).

Size of the class interval = UCLLCL.

The mean for grouped data: The cumulative frequency of a class is the frequency obtained by adding the frequency of all up to the classes preceeding the given class.

Formula to find the median for grouped data: Median = Formula to find the mode for grouped data: Mode = Tags : Statistics | Maths , 9th Maths : UNIT 8 : Statistics
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9th Maths : UNIT 8 : Statistics : Points to Remember | Statistics | Maths