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JEE Mains · Maths · STD 11 - 13. statistics

आंकड़ो \(4,5,6,6,7,8, x , y\) का माध्य व प्रसरण क्रमश: \(6\) व \(\frac{9}{4}\) है, जहाँ \(x <  y\) है । तो \(x ^4+ y ^2\) बराबर है।

  1. A \(162\)
  2. B \(320\)
  3. C \(674\)
  4. D \(420\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(320\)

Step-by-step Solution

Detailed explanation

mean \(\bar{x}=\frac{4+5+6+6+7+8+x+y}{8}=6\) \(\Rightarrow x+y=48-36=12\) Variance \(=\frac{1}{8}\left(16+25+36+36+49+64+x^{2}+y^{2}\right)-36=\frac{9}{4}\) \(\Rightarrow x^{2}+y^{2}=80\) \(\therefore x=4 ; y=8\) \(x^{4}+y^{2}=256+64=320\)
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