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What is the pmf of the number of red balls in the sample

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An urn has 3 red, 3 green and 4 yellow balls. A simple random sample of 2 balls is taken from the urn (this means without replacement).

(a) What is the pmf of the number of red balls in the sample?

(b) What is the mean of the number of red balls in the sample?

(c) Compute the standard deviation of the number of red balls in the sample.

(d) Is the answer in (c) equal to √( 2 · 0.3 · 0.7)?

Reference no: EM131877202

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