x Turn on thread page Beta
 You are Here: Home >< Maths

# statistics help watch

1. three dice are thrown. find the probability of obtaining:

(i) at least two 6s

i did 3((1/6)^2*5/6) which is wrong.. why is it wrong?

(ii) different scores on all the dice

how should i do this?
2. (Original post by Student#123)
three dice are thrown. find the probability of obtaining:

(i) at least two 6s

i did 3((1/6)^2*5/6) which is wrong.. why is it wrong?
At least two, means two or three in this case.

(ii) different scores on all the dice

how should i do this?
First die can be anything.
Then what's the probability that the second die is different.
Then the third.
3. (Original post by ghostwalker)
At least two, means two or three in this case.

First die can be anything.
Then what's the probability that the second die is different.
Then the third.
how do i work it out???
4. (Original post by Student#123)
how do i work it out???
Once the first die has been rolled, one number has been allocated.

So, when you roll the second die, what's the probability that it is different to the first? How many choices do you have, out of how many?
5. (Original post by ghostwalker)
Once the first die has been rolled, one number has been allocated.

So, when you roll the second die, what's the probability that it is different to the first? How many choices do you have, out of how many?
1/6*5/6*4/6

is that correct?
6. (Original post by Student#123)
1/6*5/6*4/6

is that correct?
Close. Your first die can be any number, so:

6/6*5/6*4/6

Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 17, 2013
Today on TSR

### Boyfriend slept with someone else

...we were on a break

Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE