Mathematics · Averages and Mean
20 प्रेक्षणों (observations) के एक समूह का समांतर माध्य 12.5 निकाला गया था। बाद में यह पता चला कि एक प्रेक्षण को गलती से 15 के बजाय -15 पढ़ लिया गया था। सही माध्य ज्ञात कीजिए।
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