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JEE Mains · Maths · STD 11 - 13. statistics

આપેલ માહિતીમાં \(n\) અવલોકનો \({x_1},{x_2},......,{x_n}.\) છે જો \(\sum\limits_{i - 1}^n {{{({x_i} + 1)}^2}}  = 9n\)   અને \(\sum\limits_{i - 1}^n {{{({x_i} - 1)}^2}}  = 5n \) હોય તો આ માહિતીનો પ્રમાણિત વિચલન મેળવો 

  1. A \(5\)
  2. B \(\sqrt 5\)
  3. C \(\sqrt 7\)
  4. D \(2\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\sqrt 5\)

Step-by-step Solution

Detailed explanation

\({\sum {\left( {{x_i} + 1} \right)} ^2} = 9n\,\,\,\,\,\,....\left( 1 \right)\) \({\sum {\left( {{x_i} - 1} \right)} ^2} = 5n\,\,\,\,\,\,....\left( 2 \right)\) \(\left( 1 \right) + \left( 2 \right) \Rightarrow \sum {\left( {x_i^2 + 1} \right)} = 7n\)…
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