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JEE Mains · Maths · STD 11 - 13. statistics

पाँच प्रेक्षणों का माध्य तथा मानक विचलन क्रमशः \(9\) तथा \(0\) हैं। यदि उनमें से एक प्रेक्षण इस प्रकार बदला जाए कि नया माध्य \(10\) हो जाए, तो उनका मानक विचलन है

  1. A \(0\)
  2. B \(4\)
  3. C \(2\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(2\)

Step-by-step Solution

Detailed explanation

Here mean \( = \bar x = 9\) \( \Rightarrow \bar x = \frac{{\sum {{x_i}} }}{n} = 9\) \( \Rightarrow \sum {{x_i}} = 9 \times 5 = 45\) Now, standard deviation \(=0\) \(\therefore \) all the five terms are same i.e.;\(9\). Now for changed observation…
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