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September 2, 2015

Homework Help: probability

Posted by matt on Tuesday, December 12, 2006 at 7:00pm.

Kevin has 11 CDs in his glove compartment. Six are rock and 5 are rap. He selects 3 cds at random.
What is the probability that he picks at least 2 rap cds?

Pr (two)=5/11 * 4/10 * 6/9

Pr (three ) =5/11 * 4/10 * 3/9

add those.


Not quite bobpursley.

There are 3 ways to pick 2 rap cds: (rap,rap,rock),(rap,rock,rap), and (rock,rap,rap). So,
Pr(two)=3*(5/11 * 4/10 * 6/9)
Pr(three) = same as before

add these.

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