An urn contains three red balls, four white balls, and two black balls. Four balls are drawn from the urn at random without replacement. For each red ball drawn, you win $10, and for each black ball drawn, you lose $15. Let X represent your net winnings.

Compute E(X), your expected net winnings.

Question

An urn contains three red balls, four white balls, and two black balls. Four balls are drawn from the urn at random without replacement. For each red ball drawn, you win $10, and for each black ball drawn, you lose $15. Let X represent your net winnings.

Compute E(X), your expected net winnings.

anonymous · Answer

probability of red ball=3/9
probability of black ball = 2/9
probability of white ball = 4/9

dan815 · Answer

attachment

anonymous · Answer

so how would u compute the expected winnings

dan815 · Answer

|dw:1370529277149:dw|