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JEE Mains · Maths · STD 11 - 13. statistics

સંખ્યાઓ \(a, b, 8, 5, 10\) નો મધ્યક \(6\) છે તથા તેમનું વિચરણ \(6.8\) છે.જો આ સંખ્યાઓનું મધ્યક થી સરેરાશ વિચલન \(M\)હોય,તો \(25\,M=\dots\dots\dots\) 

  1. A \(60\)
  2. B \(55\)
  3. C \(50\)
  4. D \(75\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(60\)

Step-by-step Solution

Detailed explanation

\(\sigma^{2}=\frac{\sum\limits_{i=1}^{5}\left(x_{i}-\bar{x}\right)^{2}}{n}\) Mean \(=6\) \(\frac{a+b+8+5+10}{5}=6\) \(a+b=7\) \(b=7-a\) \(6.8=\frac{(a-6)^{2}+(b-6)^{2}+(8-6)^{2}+(5-6)^{2}+(10-6)^{2}}{5}\) \(34=(a-6)^{2}+(7-a-6)^{2}+4+1+18\) \(a^{2}-7 a+12=0 \Rightarrow a=4\) or…
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