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JEE Mains · Maths · STD 11 - 13. statistics

माना \(10\) प्रेक्षणों \(\mathrm{a}_1, \mathrm{a}_2, \ldots . \mathrm{a}_{10}\) के लिए \(\sum_{\mathrm{k}=1}^{10} \mathrm{a}_{\mathrm{k}}=50\) तथा \(\sum_{\forall k < j} a_k \cdot a_j=1100\) है। तो \(a_1, a_2, \ldots, a_{10}\) का मानक विचलन ........... है।

  1. A \(5\)
  2. B  \(\sqrt{5}\)
  3. C \(10\)
  4. D \(\sqrt{115}\)
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Correct Answer

(B)  \(\sqrt{5}\)

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Detailed explanation

\( \sum_{\mathrm{k}=1}^{10} \mathrm{a}_{\mathrm{k}}=50 \) \( \mathrm{a}_1+\mathrm{a}_2+\ldots+\mathrm{a}_{10}=50\) \(.........(i)\) \( \sum_{\forall \mathrm{k}<\mathrm{j}} \mathrm{a}_{\mathrm{k}} \mathrm{a}_{\mathrm{j}}=1100 \) \(...........(ii)\)…
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