what is formula of class size

class mark = upper limit + lower limit / 2
 
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CLASS SIZE = UPPER LIMIT MINUS LOWER LIMIT 

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upper limit minus lower limit
 
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Class Size = Range/Class Interval
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CLASS LIMIT = UPPER LIMIT - LOWER LIMIT/ 2.
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Range
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Difference between the numbers of the class interval like100- 120 so we have to subtract both of them like120-100=20 is the class size
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Class size = Upper limit- Lower limit
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Class size/interval= upper limit - lower limit Eg. 100 to20 Upper limit - lower limit Upper limit=100 Lower limit=20 So 100-20 =20
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