Arithmetic Mean for Group data using Direct, Short Cut and Step Deviation method

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Hi I am Prof. Ehsan Ullah. Welcome to my YouTube channel STATISTICS HUB.

About this video:
This video contains the numerical questions about three methods of Arithmetic mean such as direct method, short cut method and step deviation method. These three methods are applied on Group Data.

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Thank you so much....!!!
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sir agr X ki values even hon to middle value to ni ay gi to pir kon se value ho gi A ki

chbilognew
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How to find the value of f???? In the start of the question

saadrehman