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    I have found the mean of some grouped data on a table correctly by using coding

    i did this by using coding, finding the coded value and multiplying it by the class width and adding the value that i took away in the beggining

    how do to go from getting the mean by coding to the standard deviation now? using my table that i've added the coded y and fy and fy^2

    tell me if this is confusing
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    Consider how the modifications you made to the data would affect the extent to which they deviated from the mean value.
    • Thread Starter
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    actually i worked it out in the end now, thanks for the reply though
 
 
 
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Updated: November 13, 2008

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