Homework Help: Math

Posted by Jill on Tuesday, January 25, 2011 at 11:15am.

There are 7 rap songs, 7 rock songs and 5 classical songs to select from. Three songs are to be chosento play at random
-what is the probability that only classical songs are selected?
-what is the expected number of classical songs to be selected?

Math - Reiny, Tuesday, January 25, 2011 at 12:18pm
number of all possible triples selected = C(19,3) = 969

number with exactly one classical, 2 from the others
= C(5,1)xC(14,2) = 5(91) = 455

prob of your event = 455/969
Math - Jill, Tuesday, January 25, 2011 at 1:10pm
don't understand your answer Reiny

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