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from an urn that contains only 9 brown balls and 6 yellow balls, take a random...

from an urn that contains only 9 brown balls and 6 yellow balls, take a random sample of 3 balls without replacement. Let the random variable Z be the number of brown balls in the sample. Find: (a) P(Z=1)= (b) P(Z=2)= (c) P(Z=3)= (d) What is the Mean (Expected Value) of the number of balls drawn? (e) What is the standard deviation, SD(z) of the number of balls drawn?

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