1.

Can we use only direct method for finding mean ?

Answer» If the question have class mark than applyassumed and step deviation method and when class mark is not given then use direct method
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Sorry its A+ sigma fidi /sigma fi Step deviation method is= A +sigma fidi /sigma fi × hi
Assumed method=A+ sigma Didi/ sigma fi
No there is specific formulas for finding mean that is step deviation method, assumed method
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