સંભાવના વિતરણ \(P(X= 0)=\frac{1}{2}, \mathrm{P}(\mathrm{X}=\mathrm{j})=\frac{1}{3^{j}}(\mathrm{j}=1,2,3, \ldots, \infty)\) માટે યાર્દચ્છિક ચલ \(X\) આપવામાં આવ્યું છે તો વિતરણનો મધ્યક અને સંભાવના \(\mathrm{P}(\mathrm{X}\) એ ધન અને યુગ્મ હોય ) અનુક્રમે . . . અને . . . થાય.

A \(\frac{3}{4}\) અને \(\frac{1}{9}\)
B \(\frac{3}{4}\) અને \(\frac{1}{16}\)
C \(\frac{3}{8}\) અને \(\frac{1}{8}\)
D \(\frac{3}{4}\) અને \(\frac{1}{8}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(\frac{3}{4}\) અને \(\frac{1}{8}\)

Step-by-step Solution

Detailed explanation

mean \(=\sum x_{i} p_{i}=\sum_{r=0}^{\infty} r \cdot \frac{1}{3^{r}}=\frac{3}{4}\) \(p(x\) is even \()=\frac{1}{3^{2}}+\frac{1}{3^{4}}+\ldots \infty\) \(=\frac{\frac{1}{9}}{1-\frac{1}{9}}=\frac{1}{8}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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