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JEE Mains · Maths · STD 11 - 13. statistics

જો \(1,2,3, \ldots ., n\), (જ્યાં \(n\) અયુગ્મ છે.) નો મધ્યકથી સરેરાશ વિચલન \(\frac{5(n+1)}{n}\) હોય, તો \(n\) = ............

  1. A \(20\)
  2. B \(25\)
  3. C \(23\)
  4. D \(21\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(21\)

Step-by-step Solution

Detailed explanation

Mean deviation about mean of first \(n\) natural numbers is \(\frac{ n ^{2}-1}{4 n }\) \(\therefore n =21\)
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