Depends on the criteria.mitch_07 said:will u get a carried error if u put 5/72 as i added 36+36 instead of 36*36
Lol Acid,Acid said:Not sure if anyone has said this yet but I think the answer is:
1 - P(Sum isn't less than 45)
=
1 - (1/36 * 1/36)
=
1 - 1/1296
= 1295/1296
Please show us, share your wisdom? how do you get 46, 47, 48, 49 ? Let us knowMizz: There are 5 ways greater than 45
you left out (5*4+5*5) i guess, i got that 43?/43? which i checked it should be wrong. i guess the correct way to do this question is to think of the combination that can get more equal or more than 45 which is 20,25 and 25,25 (or is it 25,20 should be included?) then find the probability to get each of this combination and 1-ans is the correct result.Mushy18 said:hmmm......i got 8/9.
P(x) = 1 - P(more than or equal to 45)
= 1 - ( 4*5 + 5*5 ) + (5*5 + 5*5)
= 8/9
yups this is the way, you had to draw up the table of total sumSweet_Lemon said:let me see...should be
P(<45) = 1 - [ (1/36 *1/36) + (1/36 * 2/36*) + (2/36 * 1/36) ]
think tat's how i wrote it...
This is what I got. I can't work out wtf the answer is 1291/1296. I mean, it should just beO-B-1 Ken-O-B said:Therefore P(<45) = 1 - P(>=45)
= 1 - 1/144
= 143/144
I wish I did that in my exam... I'm so kicking myself right now... *Knees himself on his nose... Or get pwned by Greed just like in my avatar...*
So you are saying the probability of getting a 25 is 2/36? If you use the probability of getting a 25 as 1/36 you will get the answer of 1291/1296. I thought it was 1/36 since the only way to get 25 is to roll two fives which means (1/6)*(1/6) = 1/36idontgetit said:This is what I got. I can't work out wtf the answer is 1291/1296. I mean, it should just be
1 - P(25 + 25) - P(25 + 20) - P (20 +25) = 1 - (1/36)x(1/36) - (2/36)x(2/36)x2
What's wrong with that???
"So you are saying the probability of getting a 25 is 2/36"acmilan1987 said:So you are saying the probability of getting a 25 is 2/36? If you use the probability of getting a 25 as 1/36 you will get the answer of 1291/1296. I thought it was 1/36 since the only way to get 25 is to roll two fives which means (1/6)*(1/6) = 1/36
What are you trying to say?Sweet_Lemon said:umm...stilll discuzz the answer??? faint~~
you forgot (4,5 + 5,5) and (5,4 + 5,5)JayWalker said:What are you trying to say?
The Answer is Here:
[>_ is greater or equal to]
P(<45) = 1 - P(>_45)
= 1 -[ P(Getting a 45) + P(Getting a 46) + ... +P(Getting a 50)
It is impossible to get a sum of 46, 47, 48 and 49,
HENCE
= 1 - [(5,5 + 4,5) + (5,5 + 5,4) + (5,5 + 5,5)
= 1 - [1/16 + 1/16 + 1/16]
= 1 - [3/16]
= 13/16
That is the answer that I got and my tutor agrees.. Dunno could be wrong.. general concensus on this board if that 1029 something answer...
::SHRUG::
The method i used wasJayWalker said:What are you trying to say?
The Answer is Here:
[>_ is greater or equal to]
P(<45) = 1 - P(>_45)
= 1 -[ P(Getting a 45) + P(Getting a 46) + ... +P(Getting a 50)
It is impossible to get a sum of 46, 47, 48 and 49,
HENCE
= 1 - [(5,5 + 4,5) + (5,5 + 5,4) + (5,5 + 5,5)
= 1 - [1/16 + 1/16 + 1/16]
= 1 - [3/16]
= 13/16
That is the answer that I got and my tutor agrees.. Dunno could be wrong.. general concensus on this board if that 1029 something answer...
::SHRUG::