Q.1 (viii) In a Binomial Distribution, E(X) = 6 , Var(X) = 4.2 then the value of n is _____ A. 22 B. 24 C. 20 D. 26

Answer: C. 20 Answer: (c) 20 np = 6 and npq = 4.2 , so q = 4.2/6 = 0.7 and p = 0.3 . Hence n = 6/0.3 = 20 .

In a Binomial Distribution, \(E(X) = 6\), \(\mathrm{Var}(X) = 4.2\) then the value of \(n\) is _____

Q.1 (viii) In a Binomial Distribution, \(E(X) = 6\), \(\mathrm{Var}(X) = 4.2\) then the value of \(n\) is _____

A. 22

B. 24

C. 20

D. 26

Doubtly Asked 28 Oct 2026 Board exam · June 2026 hsc 12th Save WhatsApp Report

Best answer

Answer: C. 20

Answer: (c) 20

\(np = 6\) and \(npq = 4.2\), so \(q = \frac{4.2}{6} = 0.7\) and \(p = 0.3\). Hence \(n = \frac{6}{0.3} = 20\).

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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