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 = *UCL*
– *LCL*.

**• **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

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