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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