Write formula to evaluate mean of a classified data.
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E fixi/Efi is the required formula
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the formula is...
there are 3 formulas..
1. direct method : x = fi ×xi/fi
and other 2 are here in the pic
there are 3 formulas..
1. direct method : x = fi ×xi/fi
and other 2 are here in the pic
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