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I know i can to id buy putting it in my TI but im kinda confused.

So... Thats it?

Just do it for all the finish times, yes. Assuming Im interpretting the question correctly, yeah.

Its geometry bud...

How is this geometry? O.o

@Directrix Can you help?

I dont know man, thats what i am trying to figure out!

Its a statistics question xD

but it was in my geometry lesson...

Dunno how. But this is a typical stats question.

Weird...

Geometric Probability Distributions

|dw:1377147042414:dw|

That's how Id have done it.

Okay, so it wouldnt be|dw:1377147179820:dw|

No, 7 people didnt finish in 12 seconds :P

Alright just double checking! thanks!

Yep, np :3

Ahh okay that all makes sense now!

Your probabilities should add up to 1. Did you check?

Attached is a comment on this by @Valpey

P for probability. Use the proper notation.
|dw:1377147899106:dw|