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Measures of Central Tendency — Economics STD 11 Commerce — Question

CBSE BoardEnglish MediumSTD 11 CommerceEconomicsMeasures of Central Tendency1 Mark
Question
Give the formula for calculating arithmetic mean by Step Deviation Method in continuous series.
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Answer

$\overline{\text{X}}=\text{A}+\frac{\Sigma\text{fd}'}{\Sigma\text{f}}\times\text{i}$

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