A group of 9 friends includes 4 Americans, 2 Canadians, and 3 Italians. Three friends are...

A group of 9 friends includes 4 Americans, 2 Canadians, and 3 Italians. Three friends are to be selected at random for a trip. Let X denote the number of Americans and Y be the number of Canadians selected at random among the three friends selected for a trip.

1) Find the joint probability density function of the random variables X and Y and the marginal density functions.

2) Find Cov(2X-1, -Y+1).

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Expert Solution

orchestra answered 11 months ago

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