Raffle Probability Question (1 Viewer)

[The Bograt]

The one with the 10 people, 7 draws...

Part 3, did anyone else get 30 as the number of draws required so that the probability of getting exactly 3 is higher than getting exactly 2 in 20 draws?

 

[acmilan]

Yes i also got 30

 

[VVoody]

hehe, I got an equation but couldn't bothered solving it...

 

[Sweet_Lemon]

stuffed...can't figure out... put a 5...ekek... definitely wrong~~

 

[grimreaper]

Yeah I got 30 as the answer

 

[Rorix]

30 is correct

 

[boz]

shit i got 29

 

[mishka]

i wrote out the probability in binomial form then stared at it. i might just scrape one mark out of it.... hopefully....

 

[ToO LaZy ^*]

hey i put >29.
will that still count?????????

 

[Premus]

yeah i got n> 29 too ...i think its right!

 

[ToO LaZy ^*]

booyeah!!

asdasf

 

[The Bograt]

n > 29 means that you need more than 29 draws before the chance of exactly 3 is greater than exactly 2, so the next draw would be 30

I'm not sure whether you would get full marks for n > 29, since you aren't saying exactly how many draws are needed.

 

[silvermoon]

hehe, I got an equation but couldn't bothered solving it...

thats coz ur stoopid woody...pah! how unlucky m i having 2 sit behind u 4 exams???

but, back on topic...
i got n=30 too, but i so wasn't sure it was right - im sooo relieved!!!
about the n>29 thing...how much was it out of? i cant remember (and i dont want 2 go look coz i never want 2 look at it again!). i'd assume you'd get something for it, but didnt the question ask for the first value of n - id think they want the exact answer, but hey, who knows? ur answer is still 'right' in that sense.

 

[The Bograt]

It was worth 2, so if you got n > 29 you would get 1 mark