Answer :
From Direct method:
Mean = 
= 
= 25.857
Assumed mean method: let assumed mean (A) = 25
Mean = A + 
Mean = A + 
= 25 + 
= 25 + 0.857
= 25.857
Step deviation method: Let the assumed mean (A) = 25
Mean = A + 
* h
= 25 + 
* 10
= 25 + 0.857 = 25.857
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