Homework Help: homefield

Posted by osman on Friday, March 1, 2013 at 8:14am.

There are 9 tennis balls in a box, of which only 5 have not previously
been used. Four of the balls are randomly chosen from the box. Let be the
number of new balls among the selected ones.
(a) Find the probability distribution of :
(b) Evaluate the expectation E:
(c) Evaluate the variance V ar

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