pls tell me when 2 use assumed mean and when to use step deviation method

Hi!
Here is the answer to your query.
 
Direct method can be used to find the mean of any data given in grouped form.
 
We know that direct method can be used to find the mean of any data given in grouped form, but the calculation in direct method becomes very tough when the data is given in the form of large numbers, because finding the product of xi and fi becomes difficult and time consuming. Therefore, the assumed mean method is used in this case because it involves less calculation and is an easier method.
 
When the data is given in the form of large numbers, then sometimes it is difficult and even lengthy to find the mean by using the assumed mean method. In such cases, we follow another method called step deviation method. Using this method, we can further reduce the calculation.
 
Cheers!

  • 13

 unless and until the question specifies which method to use,u can use any..

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according to what is mentioned in the queston...if not then you can use any:)

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