Probability.
This may well seem too simple but how would i work out the probability of rolling a "4" and then a "6". using P(4 or 6)=P(4) + P(6). Using this i came to the answer of 2/6 but that would mean that the probability is now greater than rolling just one 4 or 6. or am i confusing myself? shouldn't i be multiplying 1/6 * 1/6 or is that something else?
Original post by Salman_
it's 1/6 * 1/6 so 1/36
Sent from my XT1032 using Tapatalk
Sent from my XT1032 using Tapatalk
yes but how so? can you please analyse this formula for me?
p(a or b)= p(A) + p(B)
why is this a plus and not a multiplication symbol?
i'm very confused.
the "+" is what's confusing me.
(edited 7 years ago)
Original post by WarHammer-
yes but how so? can you please analyse this formula for me?
p(a or b)= p(A) + p(B)
why is this a plus and not a multiplication symbol?
i'm very confused.
the "+" is what's confusing me.
p(a or b)= p(A) + p(B)
why is this a plus and not a multiplication symbol?
i'm very confused.
the "+" is what's confusing me.
Take this example,
On a fair dice, you have 6 possible outcomes. If you throw the dice, what is the probability that you'll land on either a 1 or 2 or 3 or 4 or 5 or 6?
Original post by Salman_
I don't know why, I just know the answer. sorry.
Sent from my XT1032 using Tapatalk
Sent from my XT1032 using Tapatalk
That's quite alright mate! i had the same answer as you but i just didn't know why! lol someone might explain this phenomenon to me if not you!
thanks for trying.
Original post by IDontKnowReally
Take this example,
On a fair dice, you have 6 possible outcomes. If you throw the dice, what is the probability that you'll land on either a 1 or 2 or 3 or 4 or 5 or 6?
On a fair dice, you have 6 possible outcomes. If you throw the dice, what is the probability that you'll land on either a 1 or 2 or 3 or 4 or 5 or 6?
1/6.
Original post by WarHammer-
1/6.
What must the total probability add up to?
Original post by IDontKnowReally
What must the total probability add up to?
6.
Original post by WarHammer-
6.
No. The total probability always adds up to 1. Your teacher should have taught you this?
Original post by IDontKnowReally
No. The total probability always adds up to 1. Your teacher should have taught you this?
oh yes i know that sorry my bad.
Original post by WarHammer-
oh yes i know that sorry my bad.
Okay, so you know that the probability of each outcome is 1/6, and the total probability adds up to 1.
You also know that there are 6 possible outcomes.
Everytime you roll a dice you get one of those outcomes (you get a 1 OR you get a 2 OR a 3 OR 4 OR 5 OR 6).
1/6 + 1/6 + 1/6 +... = 1
so P(1 OR 2 OR 3 OR 4 OR 5 OR 6) =1
Does this answer your question ?
Original post by IDontKnowReally
Okay, so you know that the probability of each outcome is 1/6, and the total probability adds up to 1.
You also know that there are 6 possible outcomes.
Everytime you roll a dice you get one of those outcomes (you get a 1 OR you get a 2 OR a 3 OR 4 OR 5 OR 6).
1/6 + 1/6 + 1/6 +... = 1
so P(1 OR 2 OR 3 OR 4 OR 5 OR 6) =1
Does this answer your question ?
You also know that there are 6 possible outcomes.
Everytime you roll a dice you get one of those outcomes (you get a 1 OR you get a 2 OR a 3 OR 4 OR 5 OR 6).
1/6 + 1/6 + 1/6 +... = 1
so P(1 OR 2 OR 3 OR 4 OR 5 OR 6) =1
Does this answer your question ?
so is post number 2 correct?
Original post by WarHammer-
so is post number 2 correct?
Yes, it is. Do you understand why?
[QUOTE="IDontKnowReally;68398152"]Yes, it is. Do you understand why?[/QUOTE
(1/6)^2 because of two activities going on?
(1/6)^2 because of two activities going on?
[QUOTE="WarHammer-;68398236"]
Yes
Original post by IDontKnowReally
Yes, it is. Do you understand why?[/QUOTE
(1/6)^2 because of two activities going on?
(1/6)^2 because of two activities going on?
Yes
Quick Reply
Related discussions
- Probability help
- UCAT Medentry QR Question
- Poisson Distribution - Woodland
- A level probability maths
- Edexcel gcse maths higher probability tree question - driving test
- hard probability question
- Statistics/competition question
- Binomial distribution
- June 2018 Stats
- further stats question
- Help with a level stats question
- Probability
- A2 chemistry question relating to mass spectrometry.
- Maths statistics question
- S2 binomial distribution question
- Proability question
- Why can't you use the negative binomial here?
- Dice and combinations qs
- Hypothesis testing alevel maths
- Masters degree UK
Latest
Trending
Last reply 1 day ago
went from 3s to 9s with (literally) night before revision - ask me anythingGCSEs
59
Trending
Last reply 1 day ago
went from 3s to 9s with (literally) night before revision - ask me anythingGCSEs
59
