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Three fair coins are labeled with a zero (0) on one side and

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Joined: 30 Jul 2017
Posts: 3
Re: Three fair coins are labeled with a zero (0) on one side and  [#permalink]

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New post 13 Nov 2017, 06:38
maratikus wrote:
variance of binomial distribution is n*p*(1-p), n = 3, p = 1/2

variance = 3*1/2*(1-1/2)= 3/4

stdev = sqrt(variance) = sqrt(3)/2

After many trials sample standard deviation is close to theoretical standard deviation = sqrt(3)/2.

C is the answer.


Hello maratikus,
how you got p=1/2

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Re: Three fair coins are labeled with a zero (0) on one side and &nbs [#permalink] 13 Nov 2017, 06:38

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