an urn contains 4 red balls and 4 white balls(adsbygoogle = window.adsbygoogle || []).push({});

an experiment consists of selecting at random a sample of 4 balls and

recording the number of red balls in the sample

setup the probability distribution and compute its mean and variance

i know what a probablity distribution is. can someone please how to calculate A probability and i can calculate the rest

also i know mean = total * probability of success = what numbers exactly?

variance = SQRT(total*sucsess * failure) = what numbers exactly?

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# Urn Model

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