Class Interval help

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Hi All,



I am stuck in a simple calculation and need your help. I am calculating my data in four category/classes through mean so please let me know how to calculate this data in four classes and please note that the first mean is exactly the same value of the data i.e. -1997.



Here is the data I have arranged in a order



Block names and data



Bhiti -931 Katehari -1700 Buskhadi -1756 Jahangir Ganj -1958 Bhiyav -1997 Akbar Pur -2018 Tanda -2210 Ram Nagar -2333 Jalalpur -3071



Thanks

Hassan



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