NDA 2026 · PYQ · Probability / Binomial Distribution · medium
For a Binomial distribution with mean 6 and standard deviation √2, what is the value of P(X = 0)?
A.(1/3)⁹✓ Correct
B.(2/3)⁹
C.(1/3)(2/3)⁸
D.(2/3)(1/3)⁸
Explanation
For a binomial distribution, mean = np = 6 and variance = npq = 2. So q = npq/np = 2/6 = 1/3, which gives p = 2/3. Then n = 6/p = 6/(2/3) = 9. P(X = 0) = q^n = (1/3)^9.
💡 Practice unlimited NDA PYQs + AI-tracked progress on each topic. Sign up free →
Want more NDA practice?
Free daily 10-Q quiz · adaptive mocks · 4,000+ verified PYQs · AI doubt solver in Hindi + English