Year 12s: what will be the first way you research your future options? >>

S1 - Proability question

IShouldBeRevising_

For the second to last part I got

2/5 I did

6/10 * 3/9 * 6/8 + 4/10 * 6/9 * 3/8

Scroll to see replies

Reply 1

TenOfThem

Original post by IShouldBeRevising_

For the second to last part I got

2/5 I did

6/10 * 3/9 * 6/8 + 4/10 * 6/9 * 3/8

Which part

If you mean (i)c I get something different

Reply 2

IShouldBeRevising_

Original post by TenOfThem

Which part

If you mean (i)c I get something different

yh ic

Reply 3

IShouldBeRevising_

Original post by TenOfThem

Which part

If you mean (i)c I get something different

I don't get why my method is wrong?

Reply 4

TenOfThem

Original post by IShouldBeRevising_

I don't get why my method is wrong?

I have no idea what that method is but there is no division by 0.4 so it cannot be correct

(edited 10 years ago)

Reply 5

maggiehodgson

Have you tried drawing a probability tree?

If you did that, I'm sure you'd find all the different routes for the sequences that you are asked about. In general, I believe that your method is getting there but perhaps you are using the wrong numbers - a tree might help you to spot your own error with both numbers and number of routes.

Hope my advice will help.

Reply 6

TenOfThem

Original post by Leen!

2/15

You are not suggesting that is the answer are you?

Reply 7

Leen!

Original post by TenOfThem

You are not suggesting that is the answer are you?

Have I got it wrong? :biggrin:

Reply 8

TenOfThem

Original post by Leen!

Have I got it wrong? :biggrin:

That is the probability that the first and third are both blue

Reply 9

TenOfThem

Original post by Leen!

And what have you found, then? :smile:

The probability that the 3rd was blue given that the 1st was blue

Reply 10

Leen!

Original post by TenOfThem

The probability that the 3rd was blue given that the 1st was blue

Haha, you're funny...

Reply 11

TenOfThem

Original post by Leen!

Haha, you're funny...

In what way?

Reply 12

davros

Original post by Leen!

Haha, you're funny...

You do realize that P(A given B) and P(A and B) are different concepts in probability, don't you??

Reply 13

TenOfThem

Original post by davros

You do realize that P(A given B) and P(A and B) are different concepts in probability, don't you??

You and me ... comedy double act?

Reply 14

Leen!

Original post by davros

You do realize that P(A given B) and P(A and B) are different concepts in probability, don't you??

Oh yeah! I see. :lol:

Reply 15

Leen!

Original post by TenOfThem

In what way?

Irony.

Reply 16

davros

Original post by TenOfThem

You and me ... comedy double act?

I say, I say, I say...

Original post by Leen!

Irony.

Is that a type of metal, like goldy or bronzy?

Reply 17

ghostwalker

Original post by TenOfThem

You and me ... comedy double act?

Original post by davros

...

Interestingly, the surname fo the female star of "Ten" and Davros's creations, both start and end with the same letters.

Spooky!

(edited 10 years ago)

Reply 18

Leen!

Original post by davros

Is that a type of metal, like goldy or bronzy?

...

Reply 19

davros

Original post by ghostwalker

Interestingly, the surname fo the female star of "Ten" and Davros's creations, both start and end with the same letters.

Spooky!

There's a blue bottle in my bathroom with the same start and end letters as my name that is responsible for killing millions of germs. And my creations have killed millions throughout the galaxy!

That's spooky