(Answered) An urn contains 4 black balls and 5 white balls after a

Statistics

An urn contains 4 black balls and 5 white balls. After a thorough mixing, a ball is drawn from the urn, its color is noted, and the ball is set aside. The remaining balls are then mixed and a second ball is drawn.

(a) What is the probability distribution of the number of black balls observed?

(b) What is the probability distribution of the number of white balls observed?

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