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How did you find S1? watch

1. (Original post by badboy killa)
I got 0.625,......... i think
Great I also got 0.625 for P(C), cool.
2. I put:

4|14|444
555|15|55
66|16|6
777|17|7

and then key 14:4 means 14

Is that okay??

its a bit different.. but the keys right!
3. (Original post by MBR50)
I put:

4|14|444
555|15|55
66|16|6
777|17|7

and then key 14:4 means 14

Is that okay??

its a bit different.. but the keys right!
that looks weird but as long as u put the key it should be ok. if you hadnt the examiner would of thought u done 144, 155, 166 etc. should be fine
4. (Original post by Cool_Tori)
hey ! What did everyone get forquestion 4 a part ii)?

I got something like 92.3%?

Woohoo got this too dudes
5. did you round your exact mean value? i used my 3dp answer and got 93 and a bit %
6. (Original post by rae)
i got 7/12 for the first, as it was P(2,3) + P(3,2) + P(3,3)
for the sd of the normal i got 41 2/3 which a few other people on another thread for s1 got also.

I agree with both of these, thank god, only M2 to do now, gulp!!!
7. (Original post by rae)
did you round your exact mean value? i used my 3dp answer and got 93 and a bit %
Yeah I used the exact answer but either way is good.

16.875/18 = 0.9375

so 93.75%
Something like this anyway. Hope you got the same
8. (Original post by mensandan)
Great I also got 0.625 for P(C), cool.
I got that... I think i'm the only one who did it by factorisation though!

I got somehow:

0.7=0.2 + P(C) - (P(A)xP(C))
-0.2

therefore

0.5 = P(C) - 0.2*P(C)

I then relised I could factorise!!!

therefore

0.5 = P(C) *(1 - 0.2)

0.5 = 0.8 P(C)

therefore P(C) = 0.625

wow!

I did that in A aswell... while trying to do A) which coincidently turned out to be piss easy... cos P(A|C) = P(A) = 0.2

cos they are mutually exclusive!
9. That is exactly what I did MBR50 this is all very reassuring, great.
10. (Original post by mensandan)
Yeah I used the exact answer but either way is good.

16.875/18 = 0.9375

Something like this anyway. Hope you got the same
i sure did!

lucky about only having M2 left. I've got to resit P2 and take S2 also.

Couldn't get P(C). I got that P(C) - P(AnB) = 0.4 or 0.5, i forget which, but couldn't get any further, and given that's not what was asked, I don't think I'll get many marks for that question!
11. (Original post by chats)
that looks weird but as long as u put the key it should be ok. if you hadnt the examiner would of thought u done 144, 155, 166 etc. should be fine
Yeah, but it was weird... i was tryin to enphasise how I'd split it up :-S !!

I'd never seen one except where you split it up at the 5 mark.

ie

1|1123
1|56788
2|0012
2|56

hopefully if i loose mark(s) ill only loose one though..
12. (Original post by mensandan)
That is exactly what I did MBR50 this is all very reassuring, great.
good good!

but I believe there was a simpler method...

we must just be ace though! lol..
13. (Original post by mensandan)
I agree with both of these, thank god, only M2 to do now, gulp!!!
how many different totals were there for question 1?

was the dice 1,2,2,3,3,3

that means
1,2---1,2---1,3---1,3---1,3
2,2---2,3---2,3---2,3
2,3---2,3---2,3
3,3---3,3

are those right outcomes or are there more?
14. (Original post by chats)
how many different totals were there for question 1?

was the dice 1,2,2,3,3,3

that means
1,2---1,2---1,3---1,3---1,3
2,2---2,3---2,3---2,3
2,3---2,3---2,3
3,3---3,3

are those right outcomes or are there more?
well you only roll twice and you need a sum of 5 or more which means you only count (2,3), (3,2) and (3,3)
15. I guess there are 36 possible combinations of 2 dice scores

... 1 2 2 3 3 3

1) 2 3 3 4 4 4
2) 3 4 4 5 5 5
2) 3 4 4 5 5 5
3) 4 5 5 6 6 6
3) 4 5 5 6 6 6
3) 4 5 5 6 6 6

of which 21 out of 36 are greater or equal to 5 so 21/36 or 7/12
16. I got 41 and 2/3 for the standard deviation but 0.0465 (or similar) for the normal distribution of under 20 minutes.

I read that a lot of you got 0.0003 - I'm confused as to how?

17. attachment
Attached Files
18. ques1.doc (6.0 KB, 75 views)
19. I was a bit late there... but my versions still quite clear
20. (Original post by deianra)
I got 41 and 2/3 for the standard deviation but 0.0465 (or similar) for the normal distribution of under 20 minutes.

I read that a lot of you got 0.0003 - I'm confused as to how?

Yeah I got the same s.d then got 1-0.9406 as my probability (I(-1.56))
leaving 0.0594
21. yeah, im so confused now.... i got 0.003 tho!

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