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Binomial moments

EasyRandom VariablesStatistics~2m

A Binomial(n,p)(n,p) random variable counts successes in n=10n=10 independent trials with success probability p=0.5p=0.5. What is its variance?

Show hints (2)+
  1. A binomial is a sum of n independent Bernoullis.
  2. Variance is np(1-p).

Answer

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2.5

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Asked at: Optiver, Akuna Capital

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