239StatisticsMediumVolume Index in Marshall is ________?A∑Pn(qo + qn)/∑PnB∑Pn(Po + Pn)/∑Pn(Po + Pn)C∑Pn(Po + Pn)/∑Pn(Po + Pn) x100DNon of these Correct answerC. ∑Pn(Po + Pn)/∑Pn(Po + Pn) x100 ExplanationThe correct answer is ∑Pn(Po + Pn)/∑Pn(Po + Pn) x100.