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An urn has 5 red, 10 green and 15 yellow marbles. A simple random sample of...

An urn has 5 red, 10 green and 15 yellow marbles. A simple random sample of 5 marbles is taken from this urn. Let X denote the number of yellow marbles in the sample.

(a) What is the expectation and the standard deviation of X?

(b) What is the probability to have exactly 2 yellow marbles in the sample?

math   Statistics-And-Probability   
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