Mathematics · Statistics
20 प्रेक्षणों (observations) का माध्य और प्रसरण (variance) क्रमशः 10 और 4 पाए गए। पुनरावलोकन करने पर पता चला कि एक प्रेक्षण 9 गलत था और सही प्रेक्षण 11 था, तो सही प्रसरण है:
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