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दिया गया है:
प्रसरण σ2 =
=
इसलिए, σ2 + M2 =
हालांकि, प्रश्न में दिया गया योग 885 है, यदि हम मान लें कि योग 855 है तो:
σ2 + M2 =
इसलिए, विकल्प (b) सही है।
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