## OpenSessame 2 years ago At a track meet, 50 people ran the 100-meter dash. 2 people finished in 11 seconds, 5 people finished in 12 seconds, 8 people finished in 13 seconds, 10 people finished in 14 seconds, 21 people finished in 15 seconds, 2 people finished in 16 seconds, and 2 people finished in 17 seconds. What is the probability distribution for the finish times?

1. OpenSessame

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

2. Psymon

Well....each finish time has its own probability. Probability is (success/possibilities). So for our first time of 11 seconds. We have 50 runners, so 50 possibilities. We have 2 "successes" for 11 seconds, therefore thatprobability is 2/50. Just do the same thing with each finish result.

3. OpenSessame

So... Thats it?

4. Psymon

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

5. OpenSessame

Its geometry bud...

6. Psymon

How is this geometry? O.o

7. OpenSessame

@Directrix Can you help?

8. OpenSessame

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

9. Psymon

Its a statistics question xD

10. OpenSessame

but it was in my geometry lesson...

11. Psymon

Dunno how. But this is a typical stats question.

12. OpenSessame

Weird...

13. OpenSessame

Geometric Probability Distributions

14. Psymon

I see. Its just called that, it doesnt really have anything to do with what we think of in geometry. Just looked it up, lol.

15. OpenSessame

|dw:1377147042414:dw|

16. Psymon

That's how Id have done it.

17. OpenSessame

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

18. Psymon

No, 7 people didnt finish in 12 seconds :P

19. OpenSessame

Alright just double checking! thanks!

20. Psymon

Yep, np :3

21. Directrix

22. OpenSessame

Ahh okay that all makes sense now!

23. Directrix

24. Directrix

Attached is a comment on this by @Valpey

25. Directrix

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