ExamBro
ExamBro
JEE Mains · Maths · STD 11 - 13. statistics

यदि छ: प्रेक्षणों \(7,10,11,15, a , b\) का माध्य तथा प्रसरण क्रमशः \(10\) तथा \(\frac{20}{3}\) है, तो \(| a - b |\) का मान होगा

  1. A \(7\)
  2. B \(11\)
  3. C \(9\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(1\)

Step-by-step Solution

Detailed explanation

\(10=\frac{7+10+11+15+a+b}{6}\) \(\Rightarrow a+b=17\) \(\frac{20}{3}=\frac{7^{2}+10^{2}+11^{2}+15^{2}+a^{2}+b^{2}}{6}-10^{2}\) \(a^{2}+b^{2}=145\) Solve \((i)\) and \((ii)\) \(\mathrm{a}=9, \mathrm{~b}=8\) or \(\mathrm{a}=8, \mathrm{~b}=9\) \(|a-b|=1\)
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app