Login

Search the forums now!

Welcome, Guest. Please login or register.

September 20, 2025, 02:23:08 pm
Pages: [1]   Go Down

Author Topic: Challenging Binomial?  (Read 537 times)  Share 

0 Members and 1 Guest are viewing this topic.

kenhung123

  • Victorian
  • ATAR Notes Legend
  • *******
  • Posts: 3373
  • Respect: +7
Challenging Binomial?
« on: September 05, 2010, 10:47:18 pm »
0
OK this question is doing my head in. There is a total of 30 people which contains 10 who supports, does this simply imply that the success probability=1/3?
I tried n=11, p=1/3 and x=4 for binomialpdf, didn't seem to get the right answer. Is it not as I thought it was done?
Logged

f.sharp

  • Victorian
  • Adventurer
  • *
  • Posts: 13
  • Respect: +1
Re: Challenging Binomial?
« Reply #1 on: September 05, 2010, 10:52:03 pm »
0
0.238?
Logged

kenhung123

  • Victorian
  • ATAR Notes Legend
  • *******
  • Posts: 3373
  • Respect: +7
Re: Challenging Binomial?
« Reply #2 on: September 05, 2010, 10:54:45 pm »
0
Yea, thats what I got. But the answer is 0.298 unless its wrong?
Logged

Yitzi_K

  • Victorian
  • Forum Leader
  • ****
  • Posts: 893
  • Respect: +3
Re: Challenging Binomial?
« Reply #3 on: September 05, 2010, 10:57:29 pm »
0
I think this is a hypergeometric distribution, which is no longer on the course.
« Last Edit: September 05, 2010, 11:05:52 pm by Yitzi_K »
Logged
2009: Legal Studies [41]
2010: English [45], Maths Methods [47], Economics [45], Specialist Maths [41], Accounting [48]

2010 ATAR: 99.60

kenhung123

  • Victorian
  • ATAR Notes Legend
  • *******
  • Posts: 3373
  • Respect: +7
Re: Challenging Binomial?
« Reply #4 on: September 05, 2010, 11:03:44 pm »
0
Thank goodness.
Logged

UncleXxx

  • Victorian
  • Adventurer
  • *
  • Posts: 22
  • Respect: +1
Re: Challenging Binomial?
« Reply #5 on: September 05, 2010, 11:19:25 pm »
0
 (10/30) x (9/29) x (8/28) x (7/27) x (20/26) x (19/25) x (18/24) x (17/23) x (16/22) x (15/21) x (14/20) = (1292/1420715)

(1292/140715) x nCr(11,4) = 0.298005

Don't know any other faster way on how to do this. buh yehr.
« Last Edit: September 05, 2010, 11:21:23 pm by UncleXxx »
Logged
Pages: [1]   Go Up