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A bin contains 20 pieces of bread. 16 of the 20 pieces are biscuits, and the...

A bin contains 20 pieces of bread. 16 of the 20 pieces are
biscuits, and the remaining 4 pieces are rolls. The 20 pieces of bread
are randomly placed into 10 lunchboxes with 2 pieces going into each
lunchbox. Let X denote the number of lunchboxes that have 2 biscuits
in them. What are the mean and variance of X?

math   Statistics-And-Probability   
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