(MEDALS!!!!!!!!!) Please answer!!!!!!

Jorge has 1,280 songs on his MP3 player, and 220 of these songs are rap songs. Jorge listens to songs chosen at random. Predict the total number of songs he will have to listen to until he has heard 6 rap songs.

Question

(MEDALS!!!!!!!!!) Please answer!!!!!!

Jorge has 1,280 songs on his MP3 player, and 220 of these songs are rap songs. Jorge listens to songs chosen at random. Predict the total number of songs he will have to listen to until he has heard 6 rap songs.

e.mccormick · Answer

Because it is songs in a random order use your formula for with replacement.

e.mccormick · Answer

Well, what did you use to get that?

A single rap song is a 220/1280 chance, right?

e.mccormick · Answer

Well, first I would simplify that fraction.  Then, because it is with replacement, it is done to the power of the number of times it needs to happen.
(items/total)^events

e.mccormick · Answer

It is going to be a fraction.

random231 · Answer

but @e.mccormick  that gives the probability dosent it not how many songs the person listens to?

e.mccormick · Answer

Ah, yes.  Right.  Thinking about the probability.  Sorry.  Hmmm...

e.mccormick · Answer

Well, what method did you use to solve it?