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JEE Mains · Maths · STD 11 - 13. statistics

જો આઠ સંખ્યાઓ  \(3,7,9,12,13,20, x\) અને \(y\) નું  મધ્યક અને વિચરણ  અનુક્રમે  \(10\) અને \(25\) હોય તો  \(\mathrm{x} \cdot \mathrm{y}\) મેળવો.

  1. A \(48\)
  2. B \(56\)
  3. C \(54\)
  4. D \(58\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(54\)

Step-by-step Solution

Detailed explanation

\(\frac{3+7+9+12+13+20+x+y}{8}=10\) \(x+y=16\) \(\frac{\Sigma x^{2}}{n}-\left(\frac{\Sigma x}{n}\right)^{2}=25\) \(3^{2}+7^{2}+9^{2}+12^{2}+13^{2}+20^{2}+\mathrm{x}^{2}+\mathrm{y}^{2}=1000\) \(x^{2}+y^{2}=148\) \(x y=54\)
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