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JEE Mains · Maths · STD 12 - 13. probability

જો \(X\) માટે દ્રીપદી વિતરણ  \(B( n, p)\) માટે પ્રચલ \(n\) અને \(p\) છે કે જેથી \(P(X\, = 2)\, = P (X\, = 3)\), તો \(E(X)\), તો ચલ \(X\) નો મધ્યક મેળવો.

  1. A \(2 - p\)
  2. B \(3 - p\)
  3. C \(\frac{p}{2}\)
  4. D \(\frac{p}{3}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(3 - p\)

Step-by-step Solution

Detailed explanation

since \(X\) has a binomial distribution, \(B(n,\) \(p)\) \(\therefore \mathrm{P}(X=2)=^{n} \mathrm{C}_{2}(p)^{2}(1-p)^{n-2}\) and \(P(X=3)=^{n} C_{3}(p)^{3}(1-p)^{n-3}\) Given \(\mathrm{P}(X=2)=\mathrm{P}(X=3)\)…
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