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JEE Mains · Maths · STD 11 - 13. statistics

\(10\) અવલોકનો \(x_1, x_2, \ldots, x_{10}\) માટે, જો \(\sum_{i=1}^{10}(x_i+2)^2=180\) અને \(\sum_{i=1}^{10}(x_i-1)^2=90\) હોય, તો તેમનું પ્રમાણિત વિચલન છે:

  1. A \(2\)
  2. B \(\sqrt{3}\)
  3. C \(2\sqrt{2}\)
  4. D \(3\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(3\)

Step-by-step Solution

Detailed explanation

આપેલ છે \(\sum_{i=1}^{10}(x_i+2)^2=180\) \(\Rightarrow \sum_{i=1}^{10} x_i^2 + 4\sum_{i=1}^{10} x_i + 40 = 180\) \(\Rightarrow \sum_{i=1}^{10} x_i^2 + 4\sum_{i=1}^{10} x_i = 140\) તેમજ આપેલ છે \(\sum_{i=1}^{10}(x_i-1)^2=90\)…
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